Responses
Yeah, they ruined both their lives.
And it all started with Seoin's "mother" wanting to play house and never giving a real fuck about his adoptive son.
Al three of them: that mother, the father and the brother were and are scumbag that deserves to pay for all the pain the caused (well, for the brother is too late cause he is already dead, but...).

I beg of you Seoin, don't push Yeongwoon away, take all of what you are feeling and use it to bring hell to that shit family of yours.