It looks like the big brother is on Jitaes side but subtly doing it. Like for the sake of his mother's plan, he looks like an evil brother but in truth he cares for Jitae. Especially how he keep on trying to cover Jitae's actions to his mother.
The way his character was built, up until this point everyone's suspicious of him, lol . For some reason, Hyeon's being sincere that's just how he delivers it.
Ah finally a smile from ML without malice. A genuine smile that won't make everyone suspicious every single time.
I still feel hella suspicious ╥﹏╥
I know we're not supposed to be suspiciousbut I can't trust him lolololol