guys calm down I'm Joo's fan so listen he is jealous and just don't wanna accept his feelings for Dam.....and he is red flag so that's why he doesn't know how to show his love.....
it's just his way to show how badly he was jealous/love the things what's his.
Joo is not bad he is just dono how the relationship works cuz he never be in through
thanks
he really is a thing to be for liking