I think his brother will do something so dojun and the doctor will break up.
i have this hunch that dojun is actually a late bloomer omega he will do anything to make sure the doctor wont know because the doctor only like alphas.
then dojun will get pregnant by that doctor and will move away and his overprotective brother will hide him. ╮( ̄▽ ̄)╭
hhehehehheheeh but if this actually happens fuck that will be exciting
i can now sleep in peace thank you translator-san