Gyeong-Tae is angry to break into the room in Love Your Enemy Episode 9. But he finds out that he caught wrong people. Ji-Hye knew that Gyeong-Tae chose wrong room. She knocked at the door of Seok Ji-Won’s room. She informed it to Seok Ji-Won and Yoon Ji-Won.
Gyeong-Tae didn’t catch Seok Ji-Won red-handed. But he thinks his son has been weird. He believes that the guy conceals a secret from him. He swears to catch Seok Ji-Won. He’s angry to leave.
The next day, the teachers end the meeting. Yoon Ji-Won makes an excuse that she forgets to take her stuff. She lets the colleagues leave first. She takes Seok Ji-Won’s car. She goes to the park with Seok Ji-Won. The couple talks about the shy love words in the car. They enjoy the excitement of the secret love.
But Duk-Soo vomits in the car. So Seok Ji-Won’s secretary Ki-Ha has to take Duk-Soo and the colleagues to the park. They witness Seok Ji-Won and Yoon Ji-Won showing off love. They’re happy to rush to the two for arresting them.
Seok Ji-Won and Yoon Ji-Won return to the school. They’re interrogated separately. They confess the truth that they’re in love. Duk-Soo asks the colleagues to keep the secret for the two. Because Yoon Ji-Won and Seok Ji-Won’s family relationship is complicated.
Seok Ji-Won is tired to return home. He wants to see Yoon Ji-Won. But she rejects it because she kept going out with the excuse of running. She worries that her grandfather will suspect her. Seok Ji-Won is disappointed to hang up. The doorbell rings.
Seok Ji-Won is excited to go to open the door. He finds out that Duk-Soo took Jae-Gyu to come for congratulating him on his move. Yoon Ji-Won comes to see Seok Ji-Won after her grandfather slept. She sees the two teachers. The secret date becomes the lively housewarming party.
Duk-Soo tells the couple that he wants to hold their wedding. But Yoon Ji-Won never thought about marriage. But Seok Ji-Won planned to spend his life with Yoon Ji-Won when he confessed his feelings to her 18 years ago. He sees her falling asleep on the couch. He remembers their past. He’s sweet to fall asleep. But they sleep until dawn.
Yoon Ji-Won is scared to run home. Her grandfather mistakes that she’s going to go to work. She pretends to leave home and she arrives at the school. She sees Seok Ji-Won again. The two hold hands secretly. Soo-A is envy of Yoon Ji-Won.
Seok Ji-Won walks into the gym. He sees Yoon Ji-Won running around for teaching the students. He feels sorry for her that she didn’t have breakfast. He orders Ki-Ha to buy the students sandwich for not getting suspected. He tries to hand over the breakfast to Yoon Ji-Won. But another group of students breaks into the gym when they look at Seok Ji-Won. He has to buy all of the students sandwich.
Gyeong-Tae pays attention to the golf course project. He finds out that his son left the best road to the students. It made the members of the golf club took the bad road. Gyeong-Tae comes to the school. He sees Seok Ji-Won helping Jae-Ho trim the branches.
Jae-Ho learns that Gyeong-Tae is going to occupy the road of the students. He has an argument with him. Gyeong-Tae mocks Jae-Ho that he can do anything because it’s his land. Jae-Ho asks Kyung Hoon to persuade Gyeong-Tae. But Kyung Hoon takes Gyeong-Tae’s side.
Jae-Ho gets angry and he has a high blood pressure attack. Seok Ji-Won takes Jae-Ho aside for letting him rest. Gyeong-Tae asks Seok Ji-Won to resign.
Jae-Ho unites with the students’ parents to protest. Kyung Hoon reports it to Gyeong-Tae. He reminds him that Jae-Ho plans to make a big trouble. He persuades him to plan it in advance. But Gyeong-Tae scolds Kyung Hoon for not doing a good job. He asks him to find a way to resolve it.
Kyung Hoon remembers he witnessed Seok Ji-Won and Yoon Ji-Won getting into the room together when he was going to go out. He visits Jae-Ho. He reports to him that his granddaughter is dating Seok Ji-Won. Jae-Ho is furious to go to the school. But he sees Seok Ji-Won staring at his granddaughter with smiling. He sighs and leaves.
Seok Ji-Won returns home. He confesses it to his father that he’s dating Yoon Ji-Won. Gyeong-Tae is angry to slap Seok Ji-Won. He thinks his son was bewitched by Yoon Ji-Won. Seok Ji-Won doesn’t want his father to badmouth his girl. He claims that he wants to get together with Yoon Ji-Won even if he’s required to give up everything.
His mother Young-Eun takes him out of the house. She thinks her husband blocked her son’s love. She reveals her parents went against her to marry Gyeong-Tae. But Gyeong-Tae offered to elope if her parents keeps going against it. It gave Young-Eun the courage to go against her parents.
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Young-Eun persuades Seok Ji-Won to be brave. She thinks he shouldn’t be affected by the family resentment. She tells him to believe that Yoon Ji-Won will convince her grandfather. Her words convince the Seok Ji-Won who cannot make decision.
The episode ends with Seok Ji-Won calling Yoon Ji-Won and he asks her to come to the place he confessed to her. He takes out the wedding ring and he waits for her. She leaves the school but she runs into a man. The nightmarish memories spring into her mind. The man tries to reach out his hand to her. She’s scared to run away.