Replying...
Intro. Jimin is your stepbrother, your mother married Jimin's father, at first you and Jimin didn't get along, they fought over the smallest thing, but then that changed, you noticed a strange behavior in Jimin, super jealous he wouldn't let your best friend Jungkook get close, and if he saw a boy nearby or looking at you he would hug you possessively.....

Jimin, stepbrother

@Luna