Seok Ji-Won claims that he slipped after he saved Yoon Ji-Won in Love Your Enemy: Episode 4. She volunteers to prepare the ceremony because of his actions. He’s satisfied and he asks her to report her work to him. She works day and night to make the plan.
But Seok Ji-Won isn’t satisfied with her plans. It seems that he intended to make her redo it. She gets angry but she has to endure it. He’s happy to ask her to take him to visit the gym where the ceremony will be held. He finds out that the roof is leaking.
He orders her to go to take the ladder. Moon-Soo volunteers to help Yoon Ji-Won. Seok Ji-Won sees the feelings of Yoon Ji-Won and Moon-Soo. He’s in jealousy. Moon-Soo and Soo-A carry the ladder to the gym soon. Seok Ji-Won is confident to climb the ladder.
He almost falls off the ladder. Fortunately, Yoon Ji-Won supports the ladder. Soo-A witnesses it. She wishes Yoon Ji-Won to catch Seok Ji-Won like the plot in the K-dramas. But Yoon Ji-Won tells Soo-A that the female lead will avoid it if it happens. Because she and Seok Ji-Won will be hurt if she does so.
A student uses the basketball to hit the ladder. Seok Ji-Won falls from the ladder. He protects Yoon Ji-Won and he hugs her to fall to the cushion. The two look at each other’s eyes like what Soo-A said. They’re embarrassed to avoid each other.
Moon-Soo is hungry. Yoon Ji-Won invites him to her house for dinner. Seok Ji-Won wants to join them. But Yoon Ji-Won is heartless to reject him. Oh lady! You should invite him. He just saved you. Seok Ji-Won is angry to come to the lilac with the injured waist.
He wishes the lilac to bloom. He waters the tree. Moon-Soo comes to Yoon Ji-Won’s house. He shows off his cooking skills. He cooks a delicious tofu soup. He flatters Yoon Ji-Won’s grandfather. He makes him happy. The two become brothers.
Yoon Ji-Won takes Moon-Soo to take bus. She learns that he lives far away from the school. She thinks it would be hard to take the bus each day. But he tells her that he likes to work at the school. She recognizes him and she remembers the dark days.
It flashes back. Yoon Ji-Won’s hair turns white after she lost her parents. She goes to the hospital to see a doctor. She goes to the rooftop then. She plans to end her life. Moon-Soo is at the hospital as well. He just became national hero. But he had to retire because of his illness and his injuries.
He collapses after he was told that he cannot swim. He goes to the rooftop and he runs into Yoon Ji-Won whose hair is white. He calls her old lady. She’s furious to scold him. They sit together and they decide not to give up their lives.
Yoon Ji-Won tells her sad things to Moon-Soo that she lost her parents and she couldn’t reach her boyfriend. He drinks up the beer and he’s going to fall off the rooftop. Someone stops Yoon Ji-Won and Moon-Soo from falling. He saved the two. We learn that the person is Seok Ji-Won after Yoon Ji-Won and Moon-Soo passed out.
Seok Ji-Won visited Yoon Ji-Won’s ward after Yoon Ji-Won lost her parents. He didn’t have courage to show up in front of her. One day, he found out that she wasn’t in the ward. He went to look for her. He found her and Moon-Soo on the rooftop. He saved them.
We return to the present. Jae-Ho comes to the bus stop. Moon-Soo misses the last bus. He has to sleep over at Yoon Ji-Won’s house. The next day, Gyeong-Tae visits Jae-Ho. He wishes Jae-Ho to attend the ceremony of Seok Ji-Won. He plans to humiliate him at the ceremony.
Seok Ji-Won hears the news. He goes to Yoon Ji-Won’s house. He sees Moon-Soo going downstairs. The guy smiles at Seok Ji-Won. He greets him. Seok Ji-Won knows what happened. He thinks Moon-Soo should take a cab since he missed the last bus.
Seok Ji-Won suppresses his jealousy. He persuades his father not to resent Jae-Ho. He knows his father will fire him after his father’s legs recover. He minds Moon-Soo after he saw the teacher appear at Yoon Ji-Won’s house.
It’s ceremony day. Seok Ji-Won changes the ceremony place to the playground from the gym because the roof of the gym leaks. He prepares a bus and he sends the neighbors away. Gyeong-Tae planned to invite all of the neighbors to attend the ceremony for humiliating Jae-Ho.
Seok Ji-Won takes the reporters to show up after Gyeong-Tae arrived at the ceremony. The reporters take photos of the father and the son. Seok Ji-Won knows his father cannot drive him away once he appears in the media as the chairman of the school.
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The teachers have a dinner party in the evening. Yoon Ji-Won and Moon-Soo bring up that they knew each other early. Seok Ji-Won drinks with the teachers. He’s drunk. Moon-Soo carries Seok Ji-Won home. Gyeong-Tae is in anger. He plans to drive Seok Ji-Won out of his house.
He doesn’t know Seok Ji-Won has packed his stuff. Seok Ji-Won leaves home. He moves into Yoon Ji-Won’s house with Moon-Soo. He thinks he’s qualified to live in Yoon Ji-Won’s house because she provides rooms for the teachers. He claims that he’s the chairman of the school.