I thought he was a brat but he's actually not, just going through puberty.
He knows what's wrong and right, like about smoking, bars and lying.
He just doesn't understand some stuff due to being spoilt like why he keeps getting dumped and stuff and that's totally fine for a teenager!!
I really had a bad first impression but I'm glad I actually read it and he's the same Byul we saw as a child
His Mom probably give in into any whims he do because of how guilty he was for ignoring byul and a father whose overly protected... like dud he even count the time how late Byul was, did you guys also remember before his Mom holding him as a baby on the sofa with a wine glass and both wearing sunglasses, while wearing branded stuff, that was funny actually
They remind me of Ivan and Till, I love it