Responses

Sekye was so mentally ill that he couldn't differentiate between reality and his dream, he hallucinated so bad up to the point that he thought "Haram" (the blonde he dreamed of) was real when in fact "he" was just a hallucination he created to escape his traumatic childhood, that's why he reacted like that with the blonde dude who died, i think, since he associated every blonde dude with his hallucination
One thing I don't get is how Sekye is so sure that the person who died was the guy who showed up in his dreams and how Sekye showing up to that guys burial place got him so depressed when orinially when he first met Yijun he saw that guy get run over (so he knew he was dead), do you guys get what I mean?