Then the female lead finds out it was actually all the male leads doing and falls for him. 

So there isn't anything like this?

I am watching something *right now* where this just happened.   Show:  Black and White.   I am still early on in the show so i don't know if after the girl finds out, that she pivots her attraction to the the guy that actually did the nice thing for her or not.   Regardless,  this scenario happens above and its a big thing.   Its one of the fundamental reasons she is going for the guy she thinks did this nice thing for her.       This show really has 2 male leads....they are both hot popular C-Actors so I honestly can't call one a ML and the other 2nd Lead.    https://mydramalist.com/369-black-white