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GUYS just re-read chapter 9 to clarify the brotherly thing, so they are not twins nor are they blood related, I'm assuming he was a child from either Seo-in mom or dad side and then the parents met and got married (if that makes sense) so they both have different parents. I honestly think it's the mom son because she seems more attached to the dead brother than the father..... could be wrong.
Read chapter 1 and 2 for Seo-in and his brother relationship, I am assuming the brother liked him more than just "brother" but I guess Seo-in didn't... so yeah, he bullied Yeongwoon to take out his frustration.
Damn what a way to end S1, I like the fact that the author is making Seo-in less of an asshole. ALSO FUCK YEONGWOON DAD argh I just can't... trashy parents piss me off. And Seo-in mom, lady you ain't any better your shitty son got what he deserved, I bet the trash bro is her son and that's why she kept quiet about all the bull.
And..Haeol, my brother really, Seo-in is going to end u and that junkie so bad can't believe season 1 is done. Please don't take a long break author