He, who is about to serve mandatory military service, chose to wander the streets of Taipei on the last night spent with his girlfriend who is about to leave the country. During his time here, his troubles were not just about getting a haircut, dealing with hemorrhoids, encountering a boy, but also a subtle pain.

A-He, who has intellectual disability, always hangs out with bad students. Class leader Jie volunteers to be A-He's tutor. She keeps persuading A-He to study hard and be a decent person, but she sets him up in the end.