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If you're referring to the red head that's his friend (since at least middle school), the one that warned him about getting too close to Seo-In, when the teacher had asked YW to tutor SI. He is on break from the military so they met up during his break. Then YW borrowed his bike. And EWWW....don't tell me they're blood related. That's....gross...and wasn't mentioned..... I so hope they're not in the least bit related.....this story is complex enough without incest. pWease!
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Step is ok.
For blood-related though, I suppose if it's a lesbian or gay ship it's ok, since they can't produce offspring, which is what is the real issue. (According to science it's best to mix the gene pool so the likelihood of producing offsprings with genetic defects are lesser, and isn't carried down the generations.)
But yeah. Not into the whole incest thing though.
Step I guess can depend since they're not blood related but I think the issue is if they had always had a brotherly relationship then it would be weird.
It's just blood brothers/sisters is just don't know....or aunt and uncle or first cousins....then no. And by blood meaning half-siblings still are blood related.
Lol okay I’m a little nervous on how everything is going to play out.. That whole sex party scene in ch5 surprised me, I really do hope Seo-in isnt a trash person and hurts Yeongwoon but based on the prologue I doubt it I’m hoping that the person Seo-in was kissing in hs isnt the same person in the family picture but it probably is, they both have the same beauty mark. Have no clue who the guy at the end of ch5 is, maybe he knew Yeongwoon when he used to do judo? I’m really not sure. Overall it’s interesting, i hope everything will be fleshed out