I have this feeling that hwan is the reason y the parents of chiwoo died

I am 78% sure of this

I agree. Would kinda explain y he feels so insecure too. He knows that if Chiwoo ever found out, it'd be ruined.

Yes, i wanna see despair in hwan's eyes, i wanna see the scene where chiwoo decided to leave him

And i think, chiwoo is starting to doubt hwan