As far as I can remember, Sangwoo didn't show any romantic interest towards Bum. Bum is like an accomplice or partner to overcome his loneliness. He never even had sex with him or kissed him. So, I am confused, that Sangwoo has come to love Bum or not?
If he came to love him, it's still doubtful. If you look back into the initial chapters, Sangwoo did kiss Bum, many times. Not to forget he did get turned on twice by Bum (if i remember it correctly) Its Sangwoo we're talking about so I still don't know what to make of it xD
As far as I can remember, Sangwoo didn't show any romantic interest towards Bum. Bum is like an accomplice or partner to overcome his loneliness. He never even had sex with him or kissed him. So, I am confused, that Sangwoo has come to love Bum or not?