No one's right

I see many people saying Doyun shouldn't talk to his brother like that when he's just overprotective and worried about his well being when Dojun is also in the wrong for calling Taehan names when he doesn't even know him. Taehan has done nothing but helped Doyun thru the good and bad times but I'm sure Dojun wouldn't agree to Doyun's marriage no matter who it is because that's just the kinda person he is. So I guess both Dojun and doyun are in the wrong here. Hope things get better between them and why's the doctor suddenly so s k e t c h y like bruuuuuuu