A first year student in high school with a bad home life, he doesn't get along with his parents who has drinking and money problems. Because of the money problems, they move around a lot. Even with the help of his older brother, he still doesn't appreciate his parents.
A third year in high school, who is like a mother to anyone he meets. He gets along with his family pretty well. He has a group he hangs out with at school who calls themselves "BTS" but only secretly because it is embarrassing. He has just broken up with his girlfriend which he is pretty torn up about.
One day, Jungkook transfers into Jin's school. As Jin is assigned to show Jk around, he realizes that he's met him before. They were the two who formed the group he was in when they were in elementary. But due to family circumstances, Jk left that school. The group had lasted but Jk didn't in that group. Does Jk remember him? Can Jin fix his heart? Can Jin help Jungkook? Will Jin be able to say" I'll do anything FOR YOU, Jungkook"?