Flashback…2006…At the convenience store Baek Hee Sung (aka Do Hyun Soo) buys two beers. As Cha Ji Won completes the sale the electricity goes out. Uncomfortable, she notes the store across the street was robbed the last time the electricity was out. Hee Sung leaves. But wait, he does understand the implied message to stay and protect her, and stands outside in the cold. It begins to snow. Hee Sung holds his hand out. Ji Won watches him from the inside of the store, touched at his kindness. When the electricity comes back on, Hee Sung walks home.
Flashback…2007…Ji Won grouses that Hee Sung won't reciprocate her feelings. He says her mother seeks him out whenever she's late arriving home. Ji Won demands a piggyback home. He says nothing. Ji Won waves him home. Hee Sung starts to leave. Ji Won declares she can tell he likes her. Hee Sung wants to know how. He wonders if she wants to know the kind of man he is.
Present Day… A police officer gives Ji Won a watch found in the barn. It's Hee Sung's watch, the one with the inscribed band that Ji Won gave her husband.
Mr. Park arrives at the fishing inn. Hee Sung spies him from the window. Mr. Park sees Hee Sung from the taxi. The inn owner asks if Hee Sung called for a taxi. Hee Sung says he did not. Hee Sung says he'll talk to the taxi driver. Hee Sung approaches the taxi. Mr. Park tells him to get in.
The officer asks if that is her watch or if he should send it to forensics.
Hee Sung gets in the taxi. Mr. Park eats nuts and says he's wanted to meet him. Hee Sung asks why. Mr. Park says his wife's name, Jung Mi Sook, a murder victim killed by Do Min Seok whose body was never found.
Getting his wounds tended, Reporter Kim Moo Jin can't remember where he's heard the name Jung Mi Sook. The doctor says that was the murder victim whose body wasn't found.
Hee Sung gets a phone call which he answers. Reporter Kim Moo Jin calls him to report that Jung Mi Sook was the last murder victim of Do Min Seok. He says the killer was her husband. Mr. Park shows Hee Sung the photo the Yeonju woman was going to give the police. The photo shows Ji Won and Hee Sung in the background. Hee Sung hands up. Mr. Park asks if the baby is big now. Hee Sung tears up the photo. Mr. Park says Hyun Soo is wanted for murder. Hyun Soo says he had nothing to do with Do Min Seok's murders. Mr. Park tries to drug Hee Sung who plunges his fashioned knife into Mr. Park. Hee Sung burns the photos. Mr. Park catches up to him. This time Hee Sung succumbs to the drug. Mr. Park drags Hee Sung to his cab. His cell phone is left on the ground. The inn owner wonders what is going on.
Ji Won says she dropped the watch. The police officer gets a call about an altercation at the fishing inn.
Captain Yoon Sang Pil is not happy when Team Lead Lee Woo Cheol explains the team's work area was bugged by Mr. Park. Captain Yoon blames Detective Choi Jae Sub who claims it was a mistake. Captain Yoon declares he's embarrassed the police force. They pull each other's hair. Team Lead Lee yells at them to stop. He points out catching Mr. Park is the priority. He shares they have Mr. Park's call logs and credit card statements. Captain Yoon declares they have to catch Mr. Park tonight. He admonishes everyone not to mention the station was bugged.
Officer Im Ho Joon reports that he and Ji Won are enroute to an incident at the fishing in. Ji Won thinks back to the man at the wall, the man she chased into the barn, the man that hid his identity. Ji Won lies she had the watch in her purse. Officer Im asks when she bought it. Ji Won shares the watch is her husbands and she was taking it to get repaired. Officer Im asks why she told the officer it was her watch. Ji Won snaps that is a trivial detail.
Done tending to Moo Jin the doctor admonishes him to take care of himself. They discuss the circumstances. The doctor says Hyun Soo must be caught to find Jung Mi Sook's missing body. MH counters that Hyun Soo isn't a serial killer. The doctor declares Hyun Soo and his father killed together. They don't know Captain Yoon is eavesdropping.
The inn owner recognizes Mr. Park's photo that Officer Im shows her. She says she didn't know the guest who paid in cash. Hee Sung's cell phone rings. Ji Won sees it on the ground. She sees her daughter's photo as the wall paper. She knows this is her husband's phone. Shocked, Ji Won tells Officer Im the man abducted is probably her husband. Officer Im doesn't understand how this could be. Ji Won shows the inn owner a picture of her husband. The inn owner confirms that was the man who was abducted. Detective Choi calls. Ji Won demands to know where Mr. Park's taxi is. He tells them to get in a car.
Ji Won grabs a police car and takes off as their car is blocked. Detective Choi directs Ji Won who speeds to catch up. She sees the taxi on a parallel road. Hee Sung is passed out in the trunk. Ji Won finds a cross point and gets behind Mr. Park's taxi. He refuses to pull over. He throws something out the window. It hits the windshield of the police car. Ji Won drives into a food stand. Mr. Park gets away.
Ji Won can't believe the situation. Officer Im is okay though shaken. She apologizes for her tunnel vision about saving her husband. Officer Im points out they have to find her husband.
Reporter Kim Moo Jin isn't happy when the Yeonju police officer arrives to question him about what happened. The police officer won't share details. The doctor shares there was a witness.
Hee Sung wakes tied up on the floor of an empty indoor pool. Mr. Park calls him by Hee Sung and tells him he knows that is his new identity. Mr. Park details Hee Sung's life. Hee Sung admits it, adding more details. Hee Sung laughs. He says Do Min Seok is dead and his son, Do Hyun Soo, was the perfect target to blame. Hee Sung spouts all the negative things said about him. Mr. Park say he can kill him easily. Hee Sung calls him boring. Mr. Park stabs him. He promises to inflict pain until Hyun Soo tells her where his wife's body is. Hee Sung bites his ear and head buts Mr. Park. Hee Sung says no one can prove what he didn't do. Hee Sung is interested how it this has destroyed Mr. Park. In the room where his wife's missing photos are plastered everywhere, Mr. Park stands and stares menacingly at Hee Sung.
Ji Won is forced to report the abducted man is her husband. Detective Choi is shocked. Ji Won says she doesn't know why. Ji Won admits she's at a loss on how to proceed. Detective Choi believes they'll be able to find Mr. Park's lair eventually. Ji Won screams her husband will be dead by then. She points out that Mr. Park brutally killed Mr. Nam. She urges him to think. Detective Choi wonders why he suspected Mr. Park. He tells Officer Im and Ji Won to meet him at Mr. Park's house.
Team Lead Lee meets with Hee Sung's parents, Baek Man Woo (Hee Sung's Father but not Hyun Soo's biological father) and Gong Mi Ja (Nam Gi Ae(Hee Sung's Mother but not Hyun Soo's biological mother), to report his abduction. They ask why. Team Lead Lee asks if they've heard of Hyun Soo. They don't do a good job of hiding their shock. Team Lead Lee explains that Hyun Soo is the son of serial killer Do Min Seok. He believes the abductor will utilize their son to get Hyun Soo and that he wants to frame Hyun Soo for murder so the police catch him. Team Lead Lee assures him they will rescue their son. They ask him to save their son.
Team Lead Lee realizes that something was off in that conversation.
Hee Sung's fake father reminds his wife they knew about Hyun Soo's past but choose to use him anyhow. She rushes to her real son's room. Her husband follows. Hee Sung's fake mother believes the abductor knew Hee Sung was really Hyun Soo. She frets their secret, that Hee Sung isn't their son and really Hyun Soo will be revealed. If something happens to them, no one will take care of their real son comatose in the bed. Hee Sung's fake father believes Hyun Soo will be killed by his abductor. He tells his wife they'll pretend to be a pitiful couple manipulated by a master criminal who unbeknownst to them was a serial killer's son.
Mr. Park starts to fill the indoor pool.
Ah, the first scene of the series.
He tells Hyun Soo that he will die but has a chance to save himself. Mr. Park asks what Hyun Soo did on the day his wife was murdered, May 12, 2002. Mr. Park says that his wife was abducted in his father's car.
Reporter Kim Moo Jin and the police officer drink. He denies trying to get the police officer drunk for information. Reporter Kim Moo Jin takes a break to write information on his arm about the murder so he won't forget.
Hyun Soo can't free his feet or hands. Mr. Park says a witness saw his wife abducted in his father's car at 2:30am. But Do Min Seok was investigated and acquitted. Mr. Park declares Hyun Soo gave his father an alibi. Hyun Soo declares that was the truth. Mr. Park shows the fish charm that his wife owned. He asks why Hyun Soo had this charm.
Flashback…At his father's memorial, his sister wakes him and gives him the fish charm. She says it brings luck and to keep it with him always.
Reporters bang on Do Hae Sue (Do Hyun Soo's sister) door. She tells them she knows nothing about her brother's disappearance. She doesn't offer more much to their disappointment.
Detective Choi tells Ji Won and Officer Im that Mr. Park's apartment had advanced locks even though he claimed he was moving out soon. Detective Choi believes that Mr. Park hired the same locksmith for both his house and his lair.
The water is up to Hyun Soo's chest. Mr. Park demands to know how he got the fish charm. Hyun Soo thinks of his sister giving him the charm. He won't say anything. Mr. Park screams at him to reveal where his wife's body is.
Detective Choi, Ji Won, and Officer Im search Mr. Park's apartment. They piece together the locksmith's flyer. In route to Mr. Park's lair the locksmith says Mr. Park was an odd person.
The water is up to Hyun Soo's head. Mr. Park urges him to say where his wife is buried. Hyun Soo says he didn't kill his wife. His head goes under the water.
They arrive at Mr. Park's lair. Getting in is a challenge. Detective Choi deals with the knife welding Mr. Park. Ji Won spots her husband in the pool. She jumps in. Detective Choi tackles Mr. Park. He starts to arrest him, then Mr. Park stabs him. Under water, Ji Won tries to unhook her husband's hands. Mr. Park stands knife in hand. Officer Im bursts in and order him to drop the knife. Mr. Park grabs Detective Choi. Ji Won gives her husband mouth to mouth underwater. Detective Choi urges Officer Im to shoot Mr. Park. Detective Choi shoves Mr. Park back into the wall who hits an iron item. He falls to the ground. Detective Choi collapses. Hyun Soo opens his eyes and sees his wife.
Flashback…2007… Hee Sung wonders if Ji Won wants to know the kind of man he is. He did not graduate high school. He fought often and hard. Hee Sung sees his father, the man with the soulless eyes. He says he say things he shouldn't see. He says he's not mentally normal. Ji Won looks to where Hee Sung stares and sees nothing. She asks who he sees. Hee Sung sees a dead man. Ji Won shares she sees her dead grandmother sometimes. Hee Sung says Ji Won doesn't get it. Ji Won says he doesn't see himself the way she does. She promises to help him, teach him, be there for him. She says she can change his life. He stares into her earnest eyes. Ji Won says his gaze makes her heart beat faster. Hee Sung says he doesn't understand her. Ji Won asks if he likes her. He says nothing. She says the time for their first kiss has come. She kisses him. Hee Sung looks to his father and says he can go now. His father turns and walks away. Hee Sung is amazed. Ji Won suggests they get a drink. Hee Sung kisses her with passion.
Hee Sung stares at his wife. She goes up for more air. She sees a knife on the wall. She grabs it, gets in the pool and cuts Hee Sung's arms free. She gets him out of the pool. She gives him mouth to mouth. She screams at him to come back to her. She screams for help.
Hee Sung thinks he was lucky to have met Ji Won. But she was unlucky to have met him. Hee Sung understands what this feels like…he's sorry.