It is literally painful to read the conversation between the two. Not talking WITH each other. Back youngchan might have tried something to lure seo a bit in, like when he baited him into fu** buddies, but he really loves him.
Still to be honest, I am not sure, if it would have been better if baek youngchan would have seo told in this situation that he loves him. Seo does not have figured out he has for feelings for him. And that's kinda big problem, so maybe he needs some separate time to realise. I love how complicated it is shown, kinda like in real life.
This is the one and only, my favourite 😍