Ikrrrr!! Genuinely the only sane character in the manhwa
Mature? Sunhwa never saw Nanjo as his man to begin with, he only wanted him for the money and the gifts. He is the one that introduces Mokyeon because he thinks Nanjo sucks at sex. In my opinion he is also a dick friend. What mc did was extremly wrong i admit that. But blocking Nanjo and never want to contact him is also a dick move he can also play fair and be honest against Nanjo that he used him and didnt love him. All 3 now characters made bad choices.
Mature???
I genuinely like sunhwa as a character tbh he is 10 times more mature than our Mc. If my friend fucked my man I would Low-key slime them both ong. Sunhwa is genuinely so mature compared to our mc how does he throw away a 10 year long relationship with his best friend just for a guy he is obsessed with?