Idk I feel like Yubin was being a bit manipulative. Like as soon as Jaehwan told him oh I have a BF Yubin started drinking heavily knowing Jaehwan is too nice to just leave a drunk person. Also Jaehwan should have just told dongho the truth, I feel like by him being so cryptic when he told dongho why he didn't answer is just huh. I don't blame dongho for being upset.
Go rescue your man and kick that guy's ass (๑•ㅂ•)و✧