Comedy, Detective, Love
Yoo-Ryung
is a rookie detective. Her twin sister with autism has gone missing. To find
her sister, Yoo-Ryung applies a position in the subway police team. Ko Ji-Seok
was impressed with Yoo-Ryung’s memories for knowing the in and out of the
subway. He accepted her application and allowed her to join the team. Yoo-Ryung
has exceptional space perception. She solves cases using her exceptional space
perception and strong sense of justice. She never follows rules and
regulations. Her partner detective, Ko Ji-Seok is often busy cleaning up behind
her. Ko Ji-Seok has been influenced by her justice spirit. He also supported
her to catch the culprit even though it is not under his scope.
Ko
Ji-Seok has a mother who was sick at the mental illness hospital. He came to
visit her from time to time. Ha Ma-Ri and Kim Woo-Hyeok were Ko Ji-Seok’s
colleague. They were assigned to investigate the murder serial case in the
subway. They found out that Yoo-Ryung worked at the subway police team just to
find her missing sister. She once told
them that the answer for the culprit was in the tunnel. They started to
investigate the misery tunnel by going through all the previous case files.
Ko Ji-Seok faced financial issues. He was unable to repay
the medical expenses for his mother. When he faced a pay cut as a punishment
from the top management for not saving the life of the people, he was helpless.
One
day, there was a man who lost his money in subway. He asked Ko Ji-Seok and Yoo-Ryung
to find the money for him. One kind man returned the money to them. When Yoo-Ryung
tried to contact the man, she was unable to reach him. She called his house
number and his wife told them that he was missing. Missing man is not in their
job scope. Ko Ji-Seok refused to help the wife but Yoo-Ryung insisted to help
the wife to find his husband. The man was actually borrowed a loan from the
loan shark, Goodbye Cash. Yoo-Ryung went through his handphone number and found
out about it. The loan shark threatened him to repay the money or else they
will look for his wife and child.
Ko
Ji-Seok has no choice but to figure out the way to pay for the medical expense.
He went to the Goodbye Cash and tried to borrow some money. However, he was
nervous when Yoo-Ryung came to the place. He hides himself in the cupboard.
When Yoo-Ryung was being attacked by the loan shark, she was locked up in the
same cupboard as Ko Ji-Seok. They escaped from the cupboard when the someone
opened the cupboard. Yoo-Ryung found a will written by the man on the table to
take care of his wife and child. Ko Ji-Seok and Yoo-Ryung saved the man from
jumping off the bridge. They also managed to catch the criminal who committed
their crime for charging high interest for the loan and also instructed the man
to kill someone.
Yoo-Ryung
again decided to rescue a woman who has been bullied by her fiancé, Kim Won Tae.
Her fiancé was a great boxer who was also the ambassador of the Subway police. Yoo-Ryung
caught him at his house for hitting his fiancé. Ko Ji-Seok and his colleagues
interrogated him and asked his fiancé to file a report against him. Yoo-Ryung
tried to convince her, but she decided to forgive him once again.
Ha
Ma-Ri and Kim Woo-Hyeok were working together on the murder case in the subway.
Ma Ri was Ko Ji-Seok’s ex-girlfriend. They used to be a great partner who
solved many cases. They promised each other to earn promotion and worked in the
same department. Due to Ko Ji-Seok’s mother illness, Ko Ji-Seok decided to work
as subway police in order to have more time to take care of his mother. He
never told Ma-Ri the reason why they broke up.
Yoo-Ryung’s
colleagues found out that Kim Won Tae murdered his ex-girlfriend before. Yoo-Ryung
showed her the file and the missing evidence of wallet and the ring. She
informed her that he would beat her again. The woman did not believe that. She insisted
to trust him. After they went back home, the woman tried to find the ring that
it fell under the cupboard. Won Tae took it away and hide it while the woman
went out to do some grocery. Yoo-Ryung wanted to go to their house, but Ko Ji-Seok
warned her not to bother them. Yoo-Ryung stopped in front of their house and
called her over the phone. She promised her that she will help her free herself
from being controlled by Won Tae. While Yoo-Ryung was on her way back to the
office in the subway, she has been attacked by Won Tae.
Ko
Ji-Seok and other colleagues searched for her all over the subway. Ko Ji-Seok
found her bleeding on her head. He brought her to the hospital at once. He went
to see Kim Won Tae and fight with him. He also rescued the woman out from the
house. Kim Won Tae was captured by the police to the police station. The woman
got treatment at the hospital as well. She gave Yoo-Ryung the evidence as well
as a pen drive where her partner fought with Kim Won Tae. She was surprised and
touched. Ko Ji-Seok lied to her when she asked him about his condition on his
face.
Ko
Ji-Seok gave her a baton for safety purpose. When their colleagues gone through
the CCTV footage, they found out that there was another man who followed Yoo-Ryung
other than Kim Won Tae. Before Yoo-Ryung passed out, she also saw a black shirt
man tried to attack her after Kim Won Tae left. Yoo-Ryung continued to go to
the tunnel to find the murderer. She found out that there was a place where the
blueprint did not state. She was curious where did the tunnel heading to.
One
of the colleagues shared a video regarding the misery case that woman named
Avocado who was missing after attending the party. Yoo-Ryung started to get
more interested on the case. Ko Ji-Seok stopped her from getting any trouble as
their department was going to evaluate by the top management. Ko Ji-Seok
partnered by Yoo-Ryung managed to catch most of the perverts. However, the
other team was unsatisfied due to they across their stakeout place. Both of
them were transferred to another station to stakeout. Yoo-Ryung asked Ko
Ji-Seok the reason why he worked as subway police rather than working with Ma-Ri.
He did not answer her. Ha Ma-Ri and Kim Woo-Hyeok were assigned to investigate
the case of missing Avocado.
While
Yoo-Ryung and Ko Ji-Seok were on the way back after the party, Ko Ji-Seok saw a
petty thief who stole a wallet from a woman. He followed him and yet he got
attacked by the thief. He missed the thief. Ji Seok called Yoo-Ryung who was
sleeping in the subway to bring the woman out in the next station and make a
report about missing wallet. They later found out that many women lost their
wallet after the party in the first subway. Yoo-Ryung and Ko Ji-Seok believed
that it was done by the petty thief. They started to investigate the case by
visiting the woman. One thing in common was most of the woman who lived alone
did not go home. Ji Seok talked to Ma Ri about it. While Ma Ri and her team was
investigating the Avocado case, Ji Seok realised the man in the footage was the
petty thief.
Yoo
Ryung wanted to enter the tunnel again during midnight. Suddenly, her office
blackout. She heard someone was coming to her office. She was afraid of it.
When she opened the door, there was a hand tried to grip her neck. Luckily, Ji
Seok came in on time. Yoo Ryung was scared and cry. Ji Seok thought that she
was afraid of dark. The next morning, she told him that she did not want to be his partner anymore. Ji
Seok was furious because he could not understand why she changed her mind so
quickly. Both of them made a visit to Ma-Ri and Kim Woo-Hyeok office. Yoo Ryung
told Woo-Hyeok about the man who tried to kill her. She also told him the
reason why she did not want to be partner with Ji Seok was she did not want him
to get hurt. Ma-Ri’s mother wanted both teams to work together in order to
resolve the case. Ji Seok was jealous when Woo-Hyeok suggested that they should
change partner. All of them work together to catch the rapist. Yoo Ryung
managed to convince Avocado to face her problem and allowed her to help them to
catch the rapist. Avocado took her courage to confess in the Youtube video. The
other victim who viewed her video also changed their mind and made a police
report towards the man. Finally, they managed to find out where he worked and
also able to catch him and handed him to the police.
Ma
Ri found out the reason why Ji Seok dumped her. She realised that he has a sick
mother to take care of. She tried to fix their relationship. Yoo Ryung was
jealous when Ji Seok met his ex-girlfriend. She met up with her friend, a nurse
who take care of Ji Seok’s mother. The nurse asked her to apology to Ji Seok
that she should not hurt his feeling about sudden change of partner. She called him and left a voicemail
for him. She accidentally told him about her secret. She quickly went to the
restaurant to take Ji Seok’s phone in order to delete the voicemail. Unfortunately,
there was a password locked on it. Ji Seok always received a voicemail
notification and he found it strange.
Ji Seok changed the schedule and let
Yoo Ryung worked with Chief Kong. Chief Kang was exhausted and wanted to escape
from her. Ji Seok and the other colleagues worked on Grasshopper case. Ji Seok sold his house in order to pay debt
for his mother medical expenses.
Yoo Ryung told the Detective Kim
about the closed tunnel that not in the blue print. Detective Kim found out
that the project has been abandoned and therefore the tunnel was closed. They
tried to enter the secret tunnel as they believed that the culprit was there.
They found another door closed at the end of the tunnel. They tried to open but
they failed.
There was a bakery shop ran by a
father and a son. The son was an autism patient. He scolded his son for not
doing thing right. It reminded Yoo Ryung about her sister who also an autism
patient. One day, the son was missing while he was away from his shop. The
father looked for his son everywhere. Yoo Ryung came to help him find his son.
On the same day, the Grasshopper
also pick pocket many passenger’s wallet. Ji Seok and Yoo Ryung tried to catch
the Grasshopper while other colleague interview and wrote report for all the affected
passenger. One of the passengers took a video during a live band held in the
subway. Yoo Ryung believed that her handphone has captured the evident of
kidnapper who took away the baker’s son. She decided to help Ji Seok to catch
the Grasshopper. Unfortunately, the Grasshopper threw his bag in the trash car.
Yoo Ryung abandoned Ji Seok and went to the trash area to find the handphone.
They lost the Grasshopper.
Yoo Ryung was about to lose hope
when she can’t find the bag. Ji Seok was shocked when Yoo Ryung cried and
apologies for her wrongdoings. He helped her to find the bag. They managed to
find out the culprit and caught her in the subway. Ji Seok’s penalty has been
lifted up at the moment even though he failed his mission to catch the
Grasshopper due to his contribution to rescue the son.
When Yoo Ryung visited her friend at
the mental hospital, she was surprised to see Ji Seok there. She realized that
she was wronged for Ji Seok who struggle to pay his mother debt. One of the
cleaner, Choi Kyung-Hee offered to take care of Ji Seok’s mother as she found
out that Ji Seok was the police at the subway. Kyung-Hee has a son who was
involved in the series murder in subway.
Ji Seok overheard the conversation
between Yoo Ryung and Kim Woo-Hyeok that they will meet each other at
night. Yoo Ryung and Kim
Woo-Hyeok entered the secret tunnel and found out the missing wallet as well as
the victim belongs. All the victim belongings were there except for Yoo Ryung’s
sister. It only has her photo taken. Yoo Ryung decided to let Kim Woo-Hyeok
handled the case. While they returned to the subway, Ji Seok was angry that Yoo
Ryung entered the tunnel without his permission. Ma Ri also angry with Kim
Woo-Hyeok for secretly investigate the murder serial tunnel case behind her
back. However, Ma Ri and Kim Woo-Hyeok took over the case. She also asked Yoo
Ryung to join her team. Ji Seok did not understand why she did not tell him
anything about it. Yoo Ryung was being bullied by Ma Ri’s teammates for
abandoning her sister during the day her sister was missing. Ji Seok was
suspended for 3 months for not taking care of his subordinate. During the
meeting, Yoo Ryung realised that one of Grasshopper was related to the true murder
serial tunnel. They gave posters to the people around the subway station to
assist in investigation. The Grasshoppers suspected one another was the murder
for the murder serial tunnel case. They started not to believe anyone of them.
When
Ji Seok visited her mother, the nurse told him about Yoo Ryung’s story. He
understood her situation and feelings. He also curious about the cleaner who
acted differently when his mother told the cleaner to visit her son in the
hospital. He went to the Ma Ri’s office to find her. He argued with Ma Ri for
being cruel towards Yoo Ryung. Ji Seok and Yoo Ryung became closer to one
another. They had a drink together. Ji Seok found her room was full of
investigation on subway case. Grasshoppers decided to split ways in order not
to get caught by the police. They wanted to runaway from Seoul. One of the
Grasshopper member was being recognised by the shop owner. She called the
police to go after him. Ji Seok was having a meal with the Madam Commissioner. He
mistakenly took Yoo Ryung’s handphone. He received the call and informed Kim
Woo-Hyeok about it. He also got permission from the Madam Commissioner to allow
him to catch the Grasshopper even though he was suspended. All of them work
together as a pair to catch the Grasshopper. They barely managed to catch them
as they lose them in the end.
One
of the Grasshopper member called the police when he decided to leave alone
rather than with his teammates. The police came to the jetty to catch them.
They managed to catch 2 of them and lost 1 member. Ma Ri interrogated them to
reveal their partner. They provided her the name and age. However, the police
found out that it was fake name. He fabricated his identity.
Due
to the news about the Grasshopper case was investigated by Metro police, the
journalists published the news in the newspapers. Madam Commissioner was angry
as they have not identified whether the Grasshopper case and murder serial
tunnel case was related. After gathering the DNA of the Captain Grasshopper, Yi
Joon, they found out that the DNA was the same as in the secret tunnel. Thus,
the confirmed the identity of the murder.
Madam
Commissioner was being threatened by one of the police who would like to report
her for allowing Ji Seok to carry the duty as police even though he was
suspended. The police committee decided to send Ji Seok far away to an island.
He left only week in Seoul. Ji Seok was worried about Yoo Ryung. He stayed
outside her house every night. One day, he realised that a man was watching at
her house. He chased the man but failed to catch him. He collected all the
cigarette butt to test for DNA. He informed Woo-Hyeok and Ma Ri about. Woo-Hyeok
decided to stake out at Yoo Ryung house. He also told Yoo Ryung the truth and
also Ji Seok’s condition. She was surprised about it. The next day, she went to
the Madam Commissioner’s office to make a deal with her. She promised her that
she will catch the Grasshopper in a week, and in return Ji Seok will assigned
back to his subway police position. She told Ji Seok the good news. Ji Seok
hugged her and asked her to be his girlfriend. She hesitated because she wanted
to focus on catching the murderer.
Yoo
Ryung and Ji Seok interviewed a few people to find the person who giving out
fake identity to the people. They caught the woman and asked her about their
meeting venue and time. Yoo Ryung and Ji Seok went to the subway to find him.
they managed to catch him. When Yoo Ryung asked about her sister, he told her
that she was alive.
She was
relieved that she was alive. Yi Joon was taken by the Ma Ri and Woo-Hyeok for further
investigation. He didn’t seem to be the murder because he did not have the tic
on his shoulder. Besides that, he has an alibi that proof that he wasn’t the
murder. The cops started to confuse who the real murderer was. After interrogating
3 of them, they came to the conclusion that the murder was in the mental health
hospital. It was the hospital that Ji Seok’s mom stayed at.
Ji
Seok called the caretaker to protect his mother and don’t leave the room. The caretaker
ran out of the hospital and released the man. Ji Seok’s mother followed the
caretaker and saw the whole evidence. The caretaker released the patient out
from his room. The caretaker hided the patient in order to protect him from being
killed by her son. However, Yi Joon escaped from the jail, and managed to find
the patient. He killed him in front of his mother. Ji Seok’s mother also
witnessed the whole incident.
Ji Seok and his team realized that the
caretaker was the mother of Yi Joon. She escaped from the hospital. Yi Joon
also escaped from the hospital with the help of his partners. However, the subway
cop recognized them. They chased them and caught them. However, Yi Joon managed
to flee himself from the truck. Ji Seok and
Yoo Ryung found the restricted area at the basement. They found the blood on
the floor. Yi Joon also left a CCTV footage for her. The CCTV footage showed
that the passerby pretended to ignore to save Yi Joon’s daughter. The patient
pushed Yoo Jin and she accidentally pushed his daughter when the subway door
open. Yi Joon on the other end witnessed the whole situation. He therefore
killed all the people who was associates with the case. Yoo Ryung was shocked
to know the truth.
The caretaker brought Yoo Jin to
Sunil Motel. She requested Yoo Ryung’s friend to hide her so that Yi Joon can’t
find her. Ji Seok’s mother overheard the conversation. She told Ji Seok about
it before her dementia came back again. She tried her best to recognize her son
and protect the one he loved. Yoo Ryung
and Ji Seok went to the motel to look for the caretaker. Yoo Ryung found her
and asked her the whereabout of her sister. When she was about to tell her, Yi
Joon appeared. He attacked Yoo Ryung but being stopped by his mother. When Ji
Seok came by, Yi Joon and Yoo Ryung hided at the corner. The caretaker jumped
off the building in front of Ji Seok. Ji Seok failed to save her. He noticed Yi
Joon and Yoo Ryung. He chased him and shoot him when he tried to hurt Yoo Jin.
Yoo Jin ran far away. Yoo Ryung chased her sister but lost her at sight.
Everyone now looked for Yoo Jin who
was missing. When Ji Seok posted up the poster for missing people, he found Yoo
Jin. He talked to her and asked her to go back home. She went back home. Yoo
Ryung apologized to her for her mistake for abandoning her.
Ji Seok asked Yoo Ryung again
whether she agreed to go out with him, and she said yes. The subway police no
longer ignored cases that involving major crime at the subway. They decided to
help as much people as possible and catch those bad guys together. They always have
argument with major crime team who also worked on the same case.




