he's happy because seungwon came in heesu's life and that he can see that and seungwon is really happy being with heesu and chanyoung can see that,
so that's why chanyoung is happy because he dont want to hurt heesu's feelings for telling him that he dont like boys because he's straight, so he want heesu to have a happy and healthy relationship with seungwon, this is what i understand thanks
IM BACK FR :: I HAVE CHANGED