I just fucking love him. And I see his character development already, because when the manhua started he was all over the place, fucking different people and didn't give a shit about any of them. But when Dan appeared, he slowly became both possesive and obsessive over him, helping him with the dept, letting him stay in his house (ok, I know that he had ulterior motives, because he believes that good sex before his matches will help him win) and know he is marking his territory, by letting Heesung witness that sex scene, like "Dude, get your fucking hands off of what's mine". He wouldn't do that for any other dude he had sex with. If he didn't care at all, he would just find someone else compatible enough to help him with his jinx.