
Pls read between the lines. Its because what he felt for Kyungsoo was real. I do believe he have feelings for him/loves him.
When he blurted that thing about Dojun, notice that he went crazy like something triggered him. Its the leftover bitterness, pride and just the pent'up emotions exploded. Plus, all his life he had been Dojun this and Dojun that. That mentality couldnt heal overnight.
Whats to look at here was that in the end, his subconscious, the real, the sane Chowon was calling for Kyungsoo

I think what Chowon likes about Kyungsoo is that KS likes him just the way he is.. He doesn't have any crazy expectations (like Chowon's parents) or dates him bc of duty (like Dojun)... KS accepted him and for a short time made him forget about all the messy shit in his life... I don't think that he is in Love with KS, but sane Chowon would have fallen in love with him sooner or later ...
Lol Chowon calling out for Kyungsoo after basically telling him that he ain't shit... didn't he just declare that he would get back with Dojun? Why call out Kyungsoo's name?
Anyway
I reaaaaaally hope that Chowon gets some help after this... Nobody will cure him, he has do to that by himself and through his own will... only then will he be able to own up to his shit, make amends and maybe start anew with Kyungsoo...