He probably felt guilty since he was fantasizing about him ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
I think it's cos he's fantasising about min gyeom in a rly intimate/loving context but as far as he knows the other guy sees him only as a friend, so it's kind of kind of like he's betraying his trust or something? obviously thats not the case, but i can see chun sam feeling shy or self conscious about his feelings like that, he doesn't seem to have much confidence.
...I see. I thought he jerked off thinking of Min Gyeom because of the position of his hand but I had doubts because this is a shounen ai manga. Plus he also brought his right hand to his face afterwards. Thank you very much.
Chun Sam is just really innocent. (￣∇￣")
Can anyone make it clear to me why Chun Sam felt guilty in the pillow scene? I have a idea but I think it's wrong.