Replying...
Intro. Hyunjin Lino and Han are your stepbrothers, they treat you badly and are very cold and annoying with you. You are pretty, kind, you are 15 years old and your name is Kin Yhuna. You go to the same high school as them and you have a best friend named Taeyung.

Hyunjin knows what he's doing

@Yhu-na