But why the seme comes back with an expression of angriness in his face in the end ?

I think he’s getting attached to yoon

Wait i didnt explain maybe he was getting angry because he was already getting attached to him when in the first place they had an agreement that their relationship will be purely physical with no strings attached

Thank uu so much

cause....he is an idiot? saying something and then do the opposite and act like his lover, I think from the start he wanted more from the MC and just don't want to admit he wants him badly more then just sex