Book name:- Afraid
This is a theory
so... if you find anything dumb please don't laugh at me it's only my imagination
soo... kang Soojin and Kim shuhua both parents were homophobic. were soojin's parents success brainwashing Soojin.... shuhua's parents can't. they try so many times and told her not to cut hair and homosexual is bad and disgusting (back to chapter 19) they try to use violence also but they still fail in
end they send shuhua to cube University (actually know for there slow brainwash I guess ) that's why in chapter 2 when shuhua was walking girls was giving I'm not interested look...(back to present) shuhua is now getting adopted by yeh family (not yet I guess) (this is future okay it's my imagination) but somehow soojin's parents find out about there relationship... they try many ways to broke them apart but nothing works... then they call there friend for help (kim family) Mr. Kim and mrs.kim get shocked and somehow angry seeing there daughter in relationship... *some random trys to broke them so when they become alone try to brainwash again or use violence etc* but they always fail
in the end there homophobic level gets too high that when the school bus goes for picnic or summer camp anything... they crash a truck in it (btw bus contains ot6 idle, jisoo, Jennie, yeji and more) after the crash the news come that no one is alive in this accident