Well, you're clearly blind if you think that he's good and ok to ship Dojun with. Putting aside the fact that they're actually biological brothers, the brother clearly makes Dojun uncomfortable. Did you not realize that at all during that scene in this chapter and a bunch of other times too? Also Dojun is completely in love with Jinyoung and he makes him happy even though Jinyoung is also an asshxle too... the brother is NOT good because Dojun doesn't love him and can't make him happy.
✰ ɪ ʜᴀᴠᴇ ᴀɴ ᴜɴʜᴇᴀʟᴛʜʏ ᴏʙꜱᴇꜱꜱɪᴏɴ ᴡɪᴛʜ ʙʟ ✰