Ha-Na walks on the street in Dive Into You episode 1. The street vendor is singing a song. She’s interested in his camera. She takes out her wallet. He tells her that she only needs to pay him 1000 won. She’s surprised. He hands over the camera to her. She’s happy to thank him. He asks her to cherish the camera.
Ha-Na runs to the gym. A judo tournament is being held there. The player Woo-Jae is going to fight another player Ha-Ru. But Ha-Na only films Woo-Jae.
16 years later, Ha-Ru defeats the Japanese player in Japan. Ha-Ru’s parents Chang-Sik and Young-Sook are very happy when they watch the game at home. Chang-Sik thinks his son is like him. But Young-Sook disagrees. She says her son is like her.
Ha-Ru is interviewed by the reporter. He thanks his fans for supporting him. But he has nothing to say to his sister Ha-Na.
Ha-Na is reading a magazine on the plane. The magazine says her acting is just a soulless imitation. She takes a pill. Flight Attendant shows up. She congratulates Ha-Na. She reveals Ha-Ru just got a gold medal. She thinks her parents are very happy. Because she and Ha-Ru are so outstanding. Ha-Na tells Flight Attendant that Ha-Ru will be super proud of himself tomorrow. The whole family will have a hard time. She’s irritable when she thinks about how he looks. Ye-Rang shows up. She’s surprised that Ha-Ru got a gold medal.
Ha-Ru tells the reporter that Ha-Na probably didn’t watch his game. She didn’t care for him at all. She always scolds him, and she thinks he’s too nosy. There’s someone he truly loves deeply. He’s his friend whose judo skills far surpass his own.
At the airport, Woo-Jae sees Ha-Ru on the big screen. Ha-Ru tells Woo-Jae that he kept his promise. Woo-Jae thinks Ha-Ru is very cool.
On the plane, Ye-Rang reminds Ha-Na that the reporters are more than before because Ha-Ru. She should be careful. Ha-Na says it’s not enough. She needs to act that she worked overseas, and she also supports her twin brother. So she looks a little haggard, and she insists that she’s very happy. It’s the story of deep bond between brother and sister that those guys want to see.
Ye-Rang hands over the mirror to Ha-Na. She asks her to take a look at her expression. There’s no a trace of joy or happiness on that face. She might be able to fool the reporters. But she cannot fool the camera. Ha-Na claims that she wants to play a complex role because of her next movie. She’s preparing for the role in advance. She asks Ye-Rang to take a look at her eyes. Doesn’t she think it looks much deeper? She tells her that she doesn’t have to worry about her. She reminds her that she’s Yoon Ha-Na.
Ha-Na and Ye-Rang arrive at the airport. Woo-Jae guards Ha-Na. But she’s surrounded by the reporters. The reporter asks Ha-Na to say a few words of congratulations to Ha-Ru. Ha-Na says she believed that Ha-Ru would do a good job. She receives a bloodstained doll. The doll mocks her. He says she cannot cry.
Woo-Jae tries to throw away the doll. But Ha-Na stops him. She reminds him that a lot of people are taking photos of her. She gets in a van, and she leaves the airport.
Six months ago, Ha-Na sees a doctor. He tells her that her emotions become numb. But it won’t affect her daily life. It will affect her acting. Because her emotional sensitivity and ability to express herself has dropped.
At present, Woo-Jae checks the CCTV. He discovers that the person who gave Ha-Na the doll has a scar on his wrist. He goes to Ha-Na’s house. He cleans the house, and he puts the milk into the fridge. He gets in her bedroom. She’s sleeping in the bed. He turns off the light. He tries to leave. But she asks him why he turned off the light. She needs to remove her makeup. He asks her to get up. She says she doesn’t have the strength. He tells her that he cannot help her wash her face.
She asks him does he think it’s very easy to touch her face? He actually dared to reject her. She asks him to help her remove her makeup. As for today. She needs to try on her dress tomorrow. He helps her remove her makeup. He brings up the camera in the living room. She says the camera won’t turn on. He persuades her to fix it. She says the camera was a secondhand item when she bought it. She thinks it cannot be fixed. She asks him doesn’t he get tired of it to stay by her side. To be her friend. He says she wouldn’t give him the chance to make him feel bored. She admits that her charm is truly extraordinary. He applies a face mask to her.
The next day, Ha-Ru drives on the road. He calls Ye-Rang. He tells her that he’s in her heart. She mentions he’s in Woo-Jae’s heart. He asks her why is she upset again? She mentions he said the person he loved most was Woo-Jae. She didn’t know it. He tells her that he loves Woo-Jae more than his own life. She’s his eternal captain. So he asks her to lead him until she dies. He guesses she must be very happy. She says she’s very busy, and she doesn’t have time to be happy. She does it because of Ha-Na’s cover.
Ha-Na goes to the store to try on a dress. Woo-Jae tells her that she should take it easy. She gets in the store. She gives the presents to the fashion designer and the salesgirls. She tells the fashion designer that she wants to be pretty at the awards ceremony. She wears the white dress. Woo-Jae is lost in thought when he looks at her. The fashion designer tells Ha-Na that only she can handle his dresses.
Ha-Ru shows up. He asks Ha-Na about the photo yesterday. Woo-Jae explains it to Ha-Na that he asked Ha-Ru to come. Ha-Ru claims that he’s Ha-Na’s older brother. She points out that he was just born two minutes before her.
In the evening, Ha-Ru eats snacks with Ha-Na at her house. She tells him that her emotions are on strike. She doesn’t laugh when she sees something funny. She doesn’t get upset when she sees something sad. Her emotions don’t want to work. He’s surprised that he’s the only one who doesn’t understand it. Ye-Rang feeds him a french fry. He says it’s a little spicy, but it’s delicious. He learns that Ha-Na cannot feel any emotions. She has such a bad temper.
He tells her that he wants to vomit when she’s striking a pose in front of the camera. He tries to provoke her. But she says the french fry is delicious. She persuades him not to waste his time. She doesn’t have any emotions to respond to him. She needs to go to sleep. She has a filming tomorrow. She threatens him that she will kill her first after she recovers. She’s just emotionally detached. Her intelligence isn’t detached.
Ye-Rang gets a call from David. She’s very happy after she received the big surprise from him. Ha-Ru asks Ye-Rang is David a man? Ha-Na reveals David is a director. She likes the director very much. He’s hot in Hollywood. David wants to cast Ha-Na. But Ha-Na goes to sleep. Ha-Ru is surprised that his sister didn’t show off. Ye-Rang leaves. Ha-Ru asks Woo-Jae when has Ha-Na been like this? Woo-Jae claims he’s just a bodyguard who receives a salary and works. He knows nothing.
Ha-Ru reminds Woo-Jae the day he defeated him. Woo-Jae remembers he took a photo with Ha-Na. He wants to know what Ha-Na said to Ha-Ru. But Ha-Ru says it’s a secret. He falls sleep on the couch. Woo-Jae goes to take the camera.
The next day, Ha-Na films on the set. She cannot cry. She explains it to the director Jun-Mo that she didn’t drink enough water. He tells her that he can change the schedule for her. Because he’s her senior. He walks away. Ha-Na sits on the bench. Woo-Jae hands over the banana milk to her. She complains it to him that she couldn’t shed tears. He persuades her to drink the milk first. She drinks it. She says it’s delicious.
The film crew staff brings the coffee to Jun-Mo. He badmouths Ha-Na. Jun-Mo scolds the film crew staff. But he sees the footage that Ha-Na takes medicine. Ye-Rang shows up. She asks the manager Suk-Min to go to prepare van.
In the evening, Ha-Na drinks at home. Woo-Jae is furious to stop her. He persuades her to take a break and get the treatment. But she doesn’t want to admit to those ridiculous rumors. He reminds her that she looks like she’s in so much pain. But she says she isn’t in any pain at all. He tells her that she doesn’t have to put on a brave face. She asks him does he want her to give up like he gave up judo? It’s good that she can take a break. But what she will gain after she flees.
He’s her bodyguard. So she cannot give up everything. She wants to continue to act. She returns to her room. He walks on the street. He sees her poster.
It flashes back. On the beach, Ha-Na cheers up Woo-Jae. She tells him that his life isn’t over even if he cannot continue to practice judo. The Jung Woo-Jae in her eyes is still very handsome. But he says there’s nothing he’s good at anymore. She smiles to tell him that he can protect her. After she becomes a famous actress, he needs to protect her. At present, Ha-Na thinks she’s terrible.
The next day, Ye-Rang arrives at her office. She’s angry. Because the director believes the rumor. In the evening, Ha-Na arrives at the Awards Ceremony. Woo-Jae reaches out his hands to her. He tells her that she doesn’t have to be afraid of it.
Ha-Na wins the Best Actress Award. She confesses she’s sick. She announces she’s going to take a break. Chang-Sik is moved after he watched Ha-Na’s speech. He asks Ha-Ru not to eat at the moment.
Ha-Na takes photos with the guests in the room. The guests leave. Ha-Na tries to apologize to Woo-Jae for what she said yesterday. But he says he’s fine. They get out of the room. The killer shows up. He takes out a knife, and he runs to Ha-Na. Woo-Jae pushes Ha-Na into the room. He closes the door. The killer stabs Woo-Jae from his back. The guards show up. The killer flees. Woo-Jae strokes Ha-Na’s hair. He feels relieved after she was fine. He dies it. She cries.
The next day, Ha-Na finds her camera at Woo-Jae’s house. He watches the video that Woo-Jae filmed. He tells her that she’s the most dazzling person in his eyes. She tears up.
At the lighthouse, Ha-Na and Ha-Ru hold a funeral for Woo-Jae. They see Woo-Jae. They’re on the way home. Ha-Na tells Ha-Ru that she misses Woo-Jae. The killer drives the truck toward Ha-Na and Ha-Ru. Ha-Na and Ha-Ru fall into the sea. In the car, Ha-Na grabs the camera. She goes back to the gym in 2010. She sees Woo-Jae. She runs to him. She hugs him. She doesn’t know she’s in Ha-Ru’s body. Ha-Ru is in Ha-Na’s body. He’s shocked when he holds the camera to look at the two.