The protagonist, a fifteen-year-old middle school student who has been friends with Go Tae-seong since elementary school. He is well-built, excels in running, and plays as a striker and team captain for Unil Middle School's soccer team. He comes from a poor family, living with his grandmother who runs a tiny pharmacy. He is determined to get into Korea University to escape his difficult life in Unil-dong. He chose physical education as his path to university. He has been struggling with intense, unacknowledged romantic feelings for Go Tae-seong, experiencing jealousy and obsession. At fifteen, he finally accepted that he likes Go Tae-seong romantically, though he decided it was impossible due to both being male. He wakes up early to study alone, arrives at school an hour before class, and walks to school with Go Tae-seong every morning despite feeling uncomfortable about their class difference.
