"What do you do in the morning?"
Translation:오전에 뭐 해요?
Great question! 오전 refers to the whole AM aka all 12 hours from midnight to noon. 아침 more loosely refers to the waking hours of the morning, roughly 6 am to noon. I will say meaning varies slightly from person to person. For example my boyfriend only considers 6 am - 10 am to be 아침. It's like trying to define exactly when afternoon becomes evening. Hope this helps!