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I'm pretty sure the characters on his back are 新海 (xin hai) which in Korean would be 신해 = Shinhae which it says in chapter 4 is the company he works for!
In English these characters would mean something like 'new sea' if I'm not mistaken tho I don't think that's relevant. Someone can correct if I'm wrong my Chinese and Korean suck
i say this every chapter but the uke is so toxic in every way he's the worst kind of person to form an attachment with
honestly if this was real life I'd tell him to just move on lol people like this (outside of yaoi) don't change