Seungmin has a lot of mental issues, he hides them well but Bangchan can see right through him. Everything happens so quickly that's it's just all to much for Seungmin.
"Please you can't leave me, not today not ever Minnie"
Felix's life is a literal hell from having an abusive father to being bullied at school. He moves a lot due to his father's job. He just moved to a new city, a new school, and a new house.