Hm, I don't think Jinha would've ever been able to fall for that guy, since he admited that he actually pitied that guy from the very beginning... and he was always making a face when Xuan Ru tried to do something intimate with him, it's obvious he wasn't attracted to him that way in the slightest...
I'm not saying jinha would have ever truly fallen for xuan run but he would have at the very least viewed xuan run as a good friend who has always been there for him. And then jinha would probably have gotten coaxed into dating him until he cant take it and then break up with him. im just saying he'd have a greater chance at being with jinha if he didn't plot so hard to make jinha his.
Lu ru xuan is so dumb. Kang jinha already cherished him as a friend plus they were friends for three years. If he never plotted against jinha, jinha have likely stayed in china and ultimately lu would have been his only important person. I mean jinha is obv not very social and he takes friendship seriously so lu would have continued to be very important to him and they might have even ended up dating for real. But by plotting against jinha he basically drove him to Korea right back into siwons arms ( thank god though because I only approve of Siwon with jinha)