Everyone is shocked by the will, Jae Kyeong can’t understand what is happening. So does Oh Yoon jin. She drives Park Jun Seo’s wife Ji yeon back to the funeral home. On their way, she suggests Ji yeon conduct an autopsy hinting that Park Jun Seo isn’t the type to kill himself. Ji yeon is emotional and bursts into tears.
The other friends are annoyed by the will knowing that should it be proven Park Jun seo was murdered, Jae kyeong and Oh Yoon jin would get the money. But Tae Jin calms then down insisting it was suicide. However, he speaks to Jong su and another friend Chi yeon in private and tells them not to conduct the autopsy. He says that one more person was mentioned in the will, Lee Myung guk
Joo song tells Jae kyung about this Lee Myung uk and they wonder why Tae Jin never mentioned him. Just then, Ji yeon and Oh yoon jin return to the funeral house. While Ji yeon leaves, Yoon jin starts asking about insurance money which leads the other two to know she already knows about the will. Yoon Jin then decides to support Jae kyeong in claiming Jun Seo was murdered. She starts asking him questions about his death but Jae Kyeong, knowing she’s only after the money just ignores her and leaves.
Jae Kyung and Oh Yoon Jin speak with Park Tae Jin and the others, urging them to do an autopsy. However, Tae Jin refuses saying that both of them including Joo song would become the primary suspects because they would get the five million dollars if Park Jun seo was found murdered. Just then, police detectives arrive to investigate the case. Jae Kyeong wants to convince them to do an autopsy but Park Tae Jin stalls by revealing to Jun seo’s wife that her husband left insurance money for Jae Kyeong and Yoon Jin not her. Ji yeon is betrayed thinking it’s because of money they wanted to do an autopsy. As a result, She rejects the autopsy.
Everyone goes to the station and Jae kyeong’s rival, Inspector Yoo who is in charge of the case suspects Jae Jyung and Yoon jin of killing Park jun seo for money. This makes Jae kyeong insult his intelligence because he didn’t question Tae Jin or investigate properly before making conclusions. Park Tae jin then enters and harshly stops Jae kyeong from speaking to him informally as he goes over the case stressing there was no foul play and that since Park Jun seo’s wife doesn’t want an autopsy, they should close the case. But Jae kyeong attacks him in anger, believing he has something to hide. But the police chief’s arrival puts an end to their altercation.
However, to everyone’s surprise, Ji yeon changes her mind and decides to perform the autopsy on her husband. She is convinced that someone like him wouldn’t kill himself. When her daughter died, she thought she couldn’t survive but her husband was her pillar. There was no way a person with such strong conviction would decide to kill himself.
Jong Su is unnerved by this and warns Park Tae Jin to stop that autopsy from happening so the truth of what they did wouldn’t surface. After the autopsy, Park Jun seo is finally buried but Jae Kyeong doesn’t attend it because he is investigating two men who were caught fighting over the yellow drug. When he shows the drug to them, they become psychotic and even attack him to get the drug. Thankfully, the other police men arrive to help him.
After the burial, Yoon jin admits to Joo song that she wants to crack the case mostly for the insurance money which would help to bring her daughter back to her. Joo Song promises to help her mostly because he feels guilty for not helping Jun seo when he was alive.
After a meeting with the other detectives concerning the yellow drug, Jae kyeong’s superior Yeon Ju asks him to return his gun to which Jae kyung agrees but my man has no idea where the gun is.
While eating at a restaurant, Joo Song asks Yoon Jin if she knows Lee myung uk. She does, revealing that he works at Geumhyung pharmaceticules but reported to her about corruption in the company. She believed him because he was suffering from terminal lung cancer and had nothing to lose. The day after he spoke to her, he went missing. Meanwhile, Jae Kyeong discovers the same thing and visits Lee myung guk’s daughter. She is a married woman with kids and tells him everything she can about her father,
As he’s leaving her apartment, Jae Kyeong suddenly feels dizzy, the effect of the drug weighing on him. Thankfully, Yoon jin who was coming to the house saw him. She wants to take him to the hospital but he refuses so she takes him home. But on getting to his apartment, she notices the yellow drug in a carton. She then realizes Jae kyeong is doing drugs. As soon as Jae kyung sees her with the pill, he tries to snatch it from her but she runs away, locking herself in the bathroom and yelling at Jae Kyeong to come to his senses.
She stays there till night until Jae kyeong calms down. After flushing the yellow pill down the toilet, she comes out to meet Jae kyeong who is regretting not forgiving Jun seo before he died. However, he is surprised that Jun Seo used to sell drugs. After he tells Yoon jin how he became an addict, she advises him to get some help and inform the police but Jae Kyeong refuses because he will be taken off the case and once that happens, no one else will care about seeking the justice for Jun seo. He begs her to keep it a secret and premises to divulge the truth once he has caught the culprit. He then asks if she’s with the drug and Yoon jin tells him she flushed it down the toilet.
Jae kyung has mixed reactions about that. He wants to go to Lee myung Guk’s house and Yoon jin offers to drive him there. They break inside the house and after looking around they suddenly come across Lee Myung Guk’s corpse in one of the rooms. Jae kyeong calls his partner Kim changsoo to arrive with forensics. Meanwhile, he and Yoon jin think it’s odd for a dead body to emmitt so much liquid like Lee myung Guk’s corpse. They figure that he was frozen for seven months since his death and only got defrosted which could explain the fluids. Just as they are trying to figure out why he was suddenly discovered, an unknown person suddenly starts throwing fire bolts from outside causing the building to go up in flames. Jae kyung and Yoon jin manage to escape but Jae kyeong who is still affected by the drugs faints and Yoon jin tries to wake him up. He pulls through and they drive off before police arrive.
Jae kyeong tells Yoon jin to take him to the station. But he’s in a very bad shape when he arrives and his partner, a female officer, has to look for medicine to help him. But Jae kyeong wants the yellow pill. However, before he can get to it, he collapses, completely blacking out.
The epilogue cuts to a young Jae kyung watching a young Yoon jin cleaning the board as punishment for her brave remark to the teacher concerning the class motto. Later that day, Yoon jin is attracted to audiophile, a music club Park Jun seo was a part of. Jae kyeong joins as well, including a strange looking nerdish boy.
