This film is only available in the United States because of territorial licensing.

Pan-su, a successful businessman in his 40s, is hit on the ground by a person falling from a building.

Waking up, he finds himself in another body. Now Pan-su has to be Dong-hyeon, a high school student who gets bullied frequently. He finds out Dong-hyeon tried to help a girl, Hyeon-jeong, and fell off the building. When he meets her mother, Mi-seon, he immediately knows that Hyeon-jeong is his daughter. To get close to Hyeon-jeong, Pan-su takes hard physical training with her.