When she gets home, she knocks at No-young's door and confronts him about his watch. No-young shrugs it off and is playful; however, once he gets inside his apartment, he takes off his shirt, revealing a bullet wound to the camera. Jae-in does not know of this, but she suspects that No-young is also undercover as a spy. Jae-in increasingly becomes more suspicious of No-young, although she is still head-over-heels about him. One day she challenges him to a Judo match during a physical education class at school. During the match, they vocally argue, although none of their classmates or the teacher seems to notice; by the end of the match, they both know of each other's real position as undercover agents. Jae-in thereafter confesses to Seung-hee that she is not really a schoolgirl, which in turn gets Seung-hee very upset. Jae-in then receives news: her beloved uncle has been stabbed by an unknown person. She sobs, overcome with grief at the loss of her only family. The camera then shows her with Seung-hee in a car with a fellow policeman. The policeman betrays Jae-in and Seung-hee and leads them to the site where Cha Young-jae has been captured and is meeting with a rival gang leader. No-young arrives, and Jae-in teams up with him to fight off everyone. Jae-in goes to capture the rival gang leader; however, as she is handcuffing him, a gun is put to her head. She turns to see the undercover teacher, who was supposed to be on her side. He reveals to her that he was the one who stabbed her uncle, and she becomes overcome with rage. Meanwhile, No-young is wounded and running out of energy; as an undercover spy, he cannot reveal himself, for he would get caught. He slips away quietly as Jae-in punches the undercover teacher again and again. A police officer finally handcuffs the undercover teacher and leads him away. Cha Young-jae is sent off to an emergency room in an ambulance with Seung-hee, and Jae-in receives news that her uncle will get better. The movie then cuts to a scene where Jae-in is undercover once again. It has been some time since the Cha Young-jae case, although the movie does not specifically say how long. This time, Jae-in is undercover as a singing nun.