Jae Kyeong ends up stealing the yellow pill from the drawer where it was kept. But he feels disgusted with himself. He sights the surveillance cameras and heads over to the CCTV center to delete the footage of him stealing the pill. He uses chicken to distract the officers. However, when he checks, he discovers the footage of him has been wiped away. Jae Kyeong asks one of the officers who the last person to come by was. He replied that it was his partner Kim Chang Soo. What’s even more suspicious is that Kim Chang Soo didn’t record his name when he dropped by.
Meanwhile, Yoon Jin sees the little girl whose drug addict mother died from an accident seated outside her apartment. The little girl is devastated by her mother’s death and Yoon Jin tries to comfort her.
Jae Kyung, along with Yeon ju and the chief discuss Lee Myung guk’s case and they figure out that the one who froze the body and the one who put the body in the house where two different people. Lee Myung guk was buried after his body was frozen but someone else dug him up and placed him in the house. Now the one who froze and buried him is anxious to keep his secret.
Yoon Jin goes to work and tries to convince her boss to let her run the story on Lee Myung guk’s dead body found at the house but her boss believes it’s not a fact especially since she didn’t get an interview from the officer who gave her the information.Yoon Jin gives an excuse that the man would sue her. However, later her partner asks why she doesn’t want to interview the officer but she says she’s afraid for her life. Her partner wants to run the story of the addict woman who died after being hit by a car but Yoon Jin prevents him which comes as a shock considering how much she badgered him for information on the case.
However, Yoon Jin later admits it’s because of the woman’s daughter and her partner understands and decides they should focus on other cases.
Meanwhile, Jae Kyeong starts suspecting Kim Chang Soo. Considering that he and Yoon Jin where attacked after he had called him. Again, he was the first person to receive a text from him the day he was dumped in the train station. He has a lot to hide. Kim Chang Soo leaves his office space briefly and Jae Kyeong checks his laptop, feeling weird after seeing the CCTV footage of him attacking the nurse in the hospital. He wonders if Kim Chang Soo knows he’s a drug addict.
Yoon Jin and her partner are investigating a case of a woman, Park Bo rye, who died in Woonyoung hospital after some complication with her medication. However, her son refuses to grant them an interview. Suddenly, Joo Song calls Yoon Jin, telling her that Ji Yeon wants to speak with him privately. It would be weird for him to meet with a widow but Yoon Jin convinces him to speak with her.
Jae Kyeong asks one of the addicts who was caught fighting for drugs to contact his dealer. The addict replies that he would owe him a favor for that. He reveals that his dealer has a tattoo on his finger.
Then we see Jin wook, the man who took Jae Kyeong’s gun, speaking with his friend that the Doctor is no longer the person they know, he seems to be someone else.
One of the female detectives, Soo hyun discovers that the yellow pill is missing and informs Kim Chang Soo who in turn informs Jae Kyeong. Jae Kyeong is irritated by Kim Chang Soo who acts as if he doesn’t know what is happening. He scolds Soo hyun for the missing pill and closes the matter. However, when he and Kim Chang Soo are going through surveillance cameras around Lee Myung guk’s house, he asks Kim Chang Soo if he didn’t see him leaving with Yoon Jin that day. Kim Chang Soo admits he saw them but didn’t want to alert him. However, given that Kim Chang Soo is so quiet about his addiction, Jae Kyung feels he might be a spy and his irritation only increases such that he loses his temper and yells at Kim Chang Soo when he seems to be challenging him.
Joo song visits Ji Yeon. She wants to know all about her late husband’s finances and wants him to tell her everything that Jae Kyeong and Yoon Jin are doing. She believes that the money is actually hers and that her husband only left the inheritance for the two so they could solve his murder case.
Jong Su is livid upon seeing the news report on Park Jun Seo’s death which has already gone viral. He calls Tae Jin to his hideout and starts yelling at him for letting the news leak but Tae Jin is less bothered, telling him that the issue would roll over. They should be more concerned with ensuring he becomes chairman of Kumyung pharmaceutical. Kumyung company is undergoing a land renovation and ten million dollars is needed to complete the renovation. Tae Jin offers to introduce him to people who can give him the funding but Jang Soo looks down on him. He says he would only accept his contribution if such a person comes to kneel down before him.
Jae Kyeong asks another detective, detective Park if he has gotten surveillance footage around the area Park Jun Seo died but detective Park unwilling to divulge anything tells him they found no video which shocks Jae Kyeong. As detective Park leaves him, Jae Kyeong receives a message from Kim Chang Soo. It’s a sketch of the man who took his gun, Jin wook.
Meanwhile, Jin woo has received secret new orders from the doctor on how to distribute the drugs. The doctor only allows him to call him once after midnight in case of emergency.
Tae Jin suddenly barges into Ji Yeon’s house. He strangles her neck as he demands to know a certain password. But he releases her after she nearly chokes to death. Ji Yeon shouts that they were in the plot together but now that the money is going to someone else, he wants her gone. Tae Jin yells at her for requesting the autopsy and she responds that it’s because he had her go to the station. She agrees to tell him the password if he gives her one million dollars. (I’m shook)
She threatens to expose that he had an affair with her to his friends if he doesn’t cooperate. She is angry he refused to leave his wife for her. In return, she wants compensation but Park Tae Jin only laughs in disbelief.
Jae Kyeong goes to question the site manager of the construction company where Jun seo died. The site manager is vague as he lies there aren’t any surveillance cameras in the construction building except at the front gate but when Jae Kyeong threatens to question him again at the station, he folds and shows him another exit to the construction building which is located at the back.
Jae Kyeong then lets him be. However, a man with a bad leg who owns a rice shop nearby sees Jae Kyeong and tells him that the gate is closed. Jae Kyeong is drawn to the man and enters his shop to question him about the accident. But the man doesn’t know much. However, Jae Kyeong notices the shop has a surveillance camera and asks permission from the man to check it out. The man tells him he is lucky since he had wanted to get rid of old footages that day. Jae Kyeong is unaware that another friend of Jun Seo’s, Yun ho is watching him.
Meanwhile, Yoon Jin is at Ji Yeon’s place to check on her when she notices Tae Jin and Ji Yeon coming out of the building one after the other. They enter their seperate cars and drive off together. Yoon Jin thinks it’s odd and follows them. However, they take different directions.
Jae Kyeong checks the rice shop owner’s surveillance camera and notices Park Jun seo standing in front of the construction building at 10: 56 pm. The estimated time of death was between 11:00pm and 12:00 am.
Yoon Jin follows Ji Yeon to a hotel. Her suspicions of the two become clear when Tae Jin also drives into the same hotel seconds later.
The rice shop owner wants to give Jae Kyeong copies of the video footage but he refuses. The rice shop owner then reveals that six months ago, someone else had come to ask him for surveillance cameras. Jae Kyeong shows him the pictures taken of Jun Seo’s burial and asks if he recognizes anyone there but the man spots Jun Seo’s burial picture and points out he was the one. He had returned later and gave him some multi vitamins. When Jae Kyeong checks the bottle, it’s surprisingly from Kumyung pharmaceutical company.
Jae Kyeong thanks the man and leaves. Meanwhile, Yun ho who has been following him stares at the surveillance camera outside recalling that two hours after Jun seo died, he and Chi hyeon had driven past the building. He enters the rice man’s shop and after greeting him, grabs a pair of scissors on the table and stabs him with it. Then he leaves in his taxi.
Jae Kyeong returns to find the man in a pool of blood and a fire briquet burning in the shop. Before he dies, the man gives him a USB drive while Jae Kyeong desperately tries to drag his body out.
The epilogue shows a young Yoon Jin telling Jae Kyeong that Park Jun seo asked her out. She plans to accept but doesn’t want to cause issues within their friend group. Joo song who was the nerdy guy in their group also has a crush on her but has given up due to her now dating Park Jun seo.