Not exactly looking for a submissive guy x dominant girl. I'm looking for a drama or movie where the male lead is vulnerable/weak either he's being bullied or is physically weak and the FL is his protector. I would like if the dynamic remained consistent throughout the show and isn't just temporary

And these have a ML who is vulnerable at the beginning but gets stronger later on:

 

I have to mention Empress Ki    because it somewhat fits your description in my opinion. The FL is very strong and almost drags the the weak ML along. But it's a very complicated drama and not as straightforward as you wish.