Yukinon

I wonder what's the teacher's backstory, like why does she hate chidori boys so much. But if she doesn't have any backstory with someone from chidori, then I don't really get why she's acting like that lol

I don't know if my memory is correct but isn't there a panel where they showed a body that looks like Serin's in a hospital? Or that memory of mine is from another webtoon lolol. Anyways I hope Serin is just in a coma or something ╮(￣▽￣)╭