Responses
Look according to my theories huan wen never liked yunyang it was yuyang who liked him now that he has moved on and have a settled boyfriend too he’s jealous hes also jealous about the fact his crush (pink hair guy totally forgot his name) likes a girl and that broke his heart. Thats why hes still and bit sed.
[ completely my theory]
No, I'm pretty sure he is just jealous that Yuyang has everything going right for him while he is stuck in a one sided love with Yuan ( stutter)
I guess, Huan Wen (grey haired guy) has a secret crush on Yu Yang based on his reactions. He seems uneasy when Yu Yang mentions Li Huans name. And he tried to use the pink haired guy to get over his feelings for Yu Yang, but it turns out that the pink haired boy is straight (?) Well... i dont know this is just based on my observations