Seeing as there are 4 hands and only 3 people were introduced in the intro, the ML is definitely not one of them. There has to be some mystery to the story to keep it likable
SPOILER!!!!! . . . . . . . . . . . . . .Apparently it's an open ending. Indeed, there are 4 male leads, but she chooses neither of them at the end. They do stay with her, though. My source is a (every short) spoiler thread from novel updates (:
Istg if the ml is not even one of those 3