honestly what siwoo is doing is completely understandable considering he knows how difficult its gonna be if they truly get together and i believe he did that knowing byul DOESNT know the full extent to that. also its clear siwoo has an avoidant attachment style which is essentially pushing away your most beloved person no matter how much you love them, to protect ones self.
More like he's been burned before and doesn't want to be burned again!
thats clearly not the case considering byul is siwoos' first love, im saying hes pushing him away in fear that byuls feelings are temporary/ short lived considering growing up byul would go out with anyone, so someone with an avoidant attachment style tend to push away the one they love in fear of potentially getting hurt
Y'all gotta remember this is teenagers we talking about! Nothing they do makes sense. Don't be expecting them to make rational decisions.