Responses
valid point but it can also be interpreted this way. think of it as his rebellion against his father. doing the opposite of what his father wanted for him out of spite. that could also be the reason why he chose medicine in the first place. then that incident with do-kyung happening made him realise he was being petty(?) so he thought of moving on and instead of focusing on his father, he could just focus on do-kyung as his motivation. something like that.
I kinda hate that ML gave in to what his father wants, would have been nicer to see him continue studying medicine...
Like I get that ML changed his mind cause he wanted to protect MC:
"If you're ever again harassed by some people like those guys did the I can protect you."
but that could have just as well been through medicine:
"If you're ever again given some poison again I can cure you."
And like he has been trained with sword his entire life to this point all ready, I think he can protect MC just fine even now (like we saw with the guys at the market).