i dont get all the hate people here have on chanyoung, hes clearly happy that someone is interested in heesu, yes he knew that heesu likes him but chanyoung isnt gay and doesnt want to ruin their friendship? (〜 ̄△ ̄)〜
He noticed Heesu spending time with Seungwon as early as ch 10, these moments where he notices are the meaningfull, straight-faced stares. He saw them hanging out and WELL before he went over to Seungwon's house in ch 15 he was considering that maybe Seungwon could be his substitute for Heesu so that Chanyoung could try distance as a method to make Heesu give up on him since "being mean" was his previous method and "nothing worked". He goes over all this in ch 16, pgs 1-10. Maybe he is "happy for Heesu", but it's only a side thought and it's just a happy coincidence that he found out Seungwon likes Heesu, he was considering Seungwon as his substitute SOLELY because he noticed Seungwon could keep Heesu's attention while as up till then "Heesu wasn't interested in others with himself being the exception" as he says in ch 15. He was just going to push Heesu off onto a "straight guy" he didn't even know JUST because Heesu was actually giving him attention. He just decided to scope things out a little and stumbled upon his "hunch that Seungwon likes Heesu after the house visit. He didn't get his "hunch" about Seungwon liking Heesu till he went to his house and it wasn't confirmed till even later, when they were out eating and he overheard Jiyu and Seungwon, but he'd been considering Seungwon since as early as ch 10. Hopefully that explains why he's not "just trying to help" and makes it clear that his main motivation is himself.
b-but the horns.. ╥﹏╥