Flashback…Cha Ji Won gives birth to their daughter Baek Eun Ha. Baek Hee Sung and Ji Won stare at their daughter being held by the nurse. Tears fill Ji Won's eyes as she declares she's beautiful. Hee Sung admits he's worries their daughter won't like him. Ji Won chides him. When Eun Ha cries Ji Won believes that their daughter has a flood of emotions just like they do.
Do Hae Sue (Do Hyun Soo's sister) researches the mark on a green bracelet. She finds an image linked to an article on the hospital's overseas volunteer program. She sees the image of the members. Front and center is Mr. Baek. Hae Sue sees a closeup of the green bracelet. She knows it was worn by the accomplice when he gave her the fish charm and his phone number at her father's funeral. She hears a noise outside her apartment window. She looks but doesn't see anyone. She returns to her computer and sees more pictures of Mr. Baek.
Detective Choi Jae Sub drags Ji Won out of the team meeting. He knows she knew things, manipulated the investigation and lied to them. Team Lead Lee Woo Cheol demands that Detective Choi release Ji Won's wrist. Officer Im Ho Joon (Kim Jin Woo) makes sure Ji Won is okay. Ji Won says that this is between Detective Choi and herself. They go to the roof to chat.
Ji Won asks how he found out. Detective Choi doesn't want excuses. He asks when she found out. She tells him. He asks if her husband knows she knows that he's Hyun Soo. He doesn't. Detective Choi says he can prove her husband is Hyun Soo and he'll use it and keep her out of it. Detective Choi believes that Ji Won was manipulated by her husband. Detective Choi assumes her husband killed Hee Sung. Detective Choi counters that Hee Sung's parents are involved. She falls to her knees and begs for the chance to prove that her husband isn't what the world and Detective Choi assume he is. She sobs. Detective Choi kneels and says he can't do it. They'll raid CEO Yeom tonight, arrest her husband tomorrow, and she'll keep her mouth shut. He walks away as Ji Won cries.
Hyun Soo and Reporter Kim Moo Jin review the plan. If something happens to him, Moo Jin will provide the location of the humans to be sold to the police. He shares he's hidden a listening device in the money.
CEO Yeom Sang Cheol looks at the picture of the accomplice. Hyun Soo enters his office with the money. CEO Yeom's man scans the bag. Hyun Soo turns on the listening device. CEO Yeom smells the money and orders his man to count it. As Moo Jin listens, Hyun Soo asks when he'll get the address of the humans being sold. Hyun Soo calls Moo Jin and shares she's found something out and she has a favor to ask.
At the police station, Team Lead Lee briefs the team about the raid. Detective Choi returns and states Ji Won won't be participating tonight. He lies that Ji Won's daughter is sick and had to leave. Ji Won enters and says her daughter is fine and she'll join them. Detective Choi urges her to go home to her daughter. Ji Won insists on participating.
CEO Yeom provides the address of the humans being sold. Moo Jin uses the voice modulator to call Ji Won with the address.
Ji Won tells the team. They mobilize. Detective Choi tells her to stay. Ji Won refuses. Detective Choi counters she's too emotionally involved. Ji Won counters Detective Choi couldn't do it if the situation where reversed. She points out that Hyun Soo will only talk to her.
CEO Yeom burns the address. Hyun Soo asks about the accomplice. CEO Yeom holds an envelope with the accomplice's face, name and address. But the transfer is interrupted by a phone call. The contact name is Mr. Baek. CEO Yeom snatches the envelope and answers the phone. Mr. Baek tells CEO Yeom to eliminate Hyun Soo because he's working with the police and Mr. Baek will double the money. CEO Yeom thanks Mr. Baek for the information. Mr. Baek says Hyun Soo lives under a false identity so he's vulnerable and the police don't trust him. CEO Yeom hangs up and order his man to get the money. He asks Hyun Soo if he wants to be buried in the land or sea.
Mr. Baek leaves his study to find the real Hee Sung worried that Hyun Soo will kill him. Mr. Baek assures his son that won't happen. The doorbell rings. It's Hyun Soo's sister. The Baek family is shocked. Hae Sue apologizes for coming late and asks to speak with them. The door is unlocked and she enters the house.
CEO Yeom's men are chased by the police. Team Lead Lee handles one with a baton. Detective Choi and Ji Won chase another. When they corner him, the man reveals his knife and tries to stab Detective Choi. Ji Won pushes Detective Choi out of the way and takes the blow. She's wearing protective gear. Detective Choi tackles the man. Ji Won tells Detective Choi he's stupid for not wearing protective gear. Detective Choi chides her for interfering. Ji Won tells him she has something she must do.
CEO Yeom's man attacks Hyun Soo. He's too big for Hyun Soo to handle. CEO Yeom watches his man toss Hyun Soo around until he collapses. CEO Yeom asks why Hyun Soo is working with the cops. Hyun Soo asks who said so. CEO Yeom asks Hyun Soo who he told, because that's who told him. CEO Yeom says Hyun Soo that he will die. He orders his thug to tie up Hyun Soo. The fire alarms go off. The thugs find Moo Jin "testing" the fire alarm. Moo Jin sprays the thug with the fire extinguisher and yells for Hyun Soo to escape. CEO Yeom says Hyun Soo isn't going anywhere. Moo Jin flees. The thug follows. Moo Jin hides in the parking garage.
Hae Sue looks at the family photo over the Baek's mantle. Her back is to the door where Hee Sung listens and gnaws on his fingernails. Mrs. Baek is surprised that Hae Sue and Hyun Soo have reconnected. Mr. Baek points out Hae Sue's awareness that Hyun Soo is acting as their son puts them at risk. She shares that Hyun Soo told her their son is in a coma and they asked him to assume his identity. Mr. Baek ask why she came. Hae Sue shows him the green bracelet printout. She asks for the volunteers. She says they must be on edge about the reinvestigation of the Yeonju murders. The Baeks confirm this. She assures them her brother had nothing to do with their father's activities. Mr. Baek says they believe that too. He asks what the bracelet's significance is. Hae Sue shares that the accomplice attended her father's funeral wearing that bracelet. The Baeks are shocked. Hae Sue believes if she sees the man's face again, she'll recognize him. Hee Sung is obviously upset as his parents struggle to keep their composure.
Hiding under a car, Moo Jin decides to do a live feed of his situation. He tells his audience to call the police. CEO Yeom's man pulls him from under the car and bashes him repeatedly. Moo Jin broadcasts until CEO Yeom's man grabs his phone and smashes it. CEO Yeom clears out his office after tying Hyun Soo up. He throws gas on everything and declares Hyun Soo will die a painful death. Hyun Soo tells CEO Yeom to tell him who betrayed him. CEO Yeom smashes the listening device, takes the money, tells Hyun Soo this is his own fault, and holds his lighter up high. Then a gun is put to his head. Female hangs cock the gun. CEO Yeom closes the lighter. Hyun Soo sees his wife motion CEO Yeom into the office. Hyun Soo is stunned. They lock eyes. She asks if he's okay.
The police find the humans to be sold including the young victim from the first episode. Officer Im asks the young boy what happened. The boy says as long as he can go home, everything will be fine. Team Lead Lee asks Detective Choi where Ji Won is. He lies that her daughter's fever spiked. Team Lead Lee says he knows Detective Choi wouldn't lie without a good reason. Detective Choi sighs.
Flashback…Ji Won says she has to find her husband. Detective Choi says he'll arrest him tomorrow morning. He warns she only has tonight.
Hyun Soo can't believe his wife knew. She goes to handcuff CEO Yeom but he gets the advantage. He throttles Ji Won. Hyun Soo literally rips the door handles off that he's ties to. He starts to throttle CEO Yeom. Ji Won pulls him off CEO Yeom. She yells at him that Detective Choi know who he is. She orders him to run. Hyun Soo stands there in shock. Ji Won yells at him to run, not look back, and never come back. Hyun Soo stands there. Ji Won yells that he can't keep taking the blame for his sister. She yells at him to leave. Hyun Soo starts to walk away. He stops, considers, and decides he has no choice but to leave. Ji Won cries as her husband walks away.
The police get the CEO Yeom's thug under control. Moo Jin rushes to CEO Yeom's office. He lies that he's there for a story. Ji Won call for police backup.
Hyun Soo drives away and cries remembering Ji Won's declarations. He pulls over. He calls his wife.
CEO Yeom is led away.
Ji Won sees who is calling and doesn't answer. Hyun Soo calls again. Ji Won cries and doesn't answer. Hyun Soo will her to pick up. Hyun Soo declares this isn't their ending. He calls again. Ji Won gets out of a taxi and stands in front of the car.
Hyun Soo exits the car and walks to his wife. She asks why he's doing this to her. She says he can't live as Hee Sung anymore. Running away is his only option. She asks what else he wants from her. Hyun Soo can't believe she knew and didn't dump him. Ji Won can't believe he doesn't know why she tried so hard to protect him. Hyun Soo sobs and grabs his heart. He sobs he's sorry. He declares he was wrong to hurt her and cause her such pain. Ji Won hugs him and declares protecting him was the only thing she could do. They sob together. Hyun Soo says he wants to go home. Ji Won agrees. She tells him whatever happens, they begin again at home.
Mr. Baek says he'll look for the information she wants but can't guarantee he'll find what she needs because it two decades ago. Hae Sue is thankful that he'll look for the data. She stands to leave. Mrs. Baek follows and asks if Hae Sue remembers anything in particular about the accomplice. She lies it could help her husband find the accomplice. Hae Sue remembers the accomplice's fingernails were short as if he had a habit of gnawing them. The camera cuts to Hee Sung gnawing on his fingernails. He stops when he hears Hae Sue's words. He stares at his hands.
Flashback…The accomplice leaves a voicemail for Mrs. Nam not to interfere. Now we see a series of moments and Hee Sung's face is revealed.
Hee Sung knows he's in trouble.
At the hospital, CEO Yeom is patched up. He feigns an issue when the doctor walks away. He overwhelms the single police officer guarding him and grabs the key to the handcuffs. He unlocks them.
Ji Won and Hyun Soo return home. Hyun Soo looks at the family photos and cries. Ji Won cries too. They lock eyes. Ji Won hugs her husband, the man she loves. Hyun Soo hugs her back. She cries. He cries. They kiss.
CEO Yeom looks at the picture of the accomplice. It's Hee Sung. He murmurs he has one more chance. He laughs.
Hee Sung gnaws his hand while Mrs. Baek demand to know what her husband will do. Mr. Baek says Hae Sue can't prove her claim. Mr. Baek says he's already taken care of Hyun Soo. The gets Hee Sung's attention. Mr. Baek yells at his son to stop gnawing on his nails. He hits his son. Mrs. Baek yells at her husband. Hee Sung asks why it had to be Hyun Soo that he hit that fateful rainy night.
Flashback…Hee Sung tells CEO Yeom that he'll handle the situation. He asks if Mrs. Jang remembers his face. CEO Yeom assures her she doesn't. He runs into Hyun Soo when he darts into the road.
Hee Sung murmurs that Do Min Seok (Do Hyun Soo's Father) wouldn't let him be. He knows that Do Min Seok told him what to do and he did it. Hee Sung says Do Min Seok threatened his parents. He cries that he didn't want to help Do Min Seok but he had no choice. He asks if they'll protect him.
Flashback…Do Min Seok tells his young son not to run in the woods or he could fall of the cliff.
Hyun Soo shares the memory with his wife. He admits he doesn't remember much from that incident. Ji Won asks why he continued to wear the watch. Hyun Soo says it made him feel good. Ji Won shares that she heard Hyun Soo tells Hae Sue that he never loved her. Hyun Soo cries. Ji Won says he's crying because he loves her. Hyun Soo says he's not capable of love. He says he is a liar. Ji Won says she knew that he cared for her early in their relationship by the kind things he'd do for her. She says when her father died, he stood by her and supported her without pressuring her to grieve in a particular timeframe. Ji Won declares she can feel his love. Hyun Soo tells his wife he loves her. He kisses her hand. He repeats the declaration. Ji Won says tomorrow the world will judge him by another filter. Hyun Soo says that doesn't matter. Ji Won urges him not to forget he loves. Hyun Soo says odd to trust him. Hyun Soo tells more of his story. He says he survived multiple near-death experiences before they met. Hyun Soo says his relationship with Ji Won is the oddest and best part of his life's story.
The next morning, Detective Choi arrives at the house to arrest Hyun Soo.
Hae Sue goes to Moo Jin and demands to know why he didn't answer he calls. She sees his face. Moo Jin admits he doesn't know if Hyun Soo is okay. Moo Jin admits Ji Won knows the truth about her brother.
Ji Won talks to Detective Choi on the phone. She asks him not to handcuff him. She promises to bring her husband out in 30 minutes. Hyun Soo sits up. Ji Won says Detective Choi is there to arrest him.
Ji Won leads her husband out of the house to a waiting Detective Choi. They are holding hands. They stare at Detective Choi.