Dude, the "bastard" is the MC
The MC (main character) is the protagonist, who is a girl.
What you must mean is ML (Male Lead) who is the male love interest (Likewise, FL is the female lead). Secondary love interests are likewise scalled "2nd ML". There's even a "2nd ML syndrome" where readers often prefer the 2nd ML over the ML. (It's true, you can google).
Obviously ML and FL are terms from a binary way of thinking where theres a protagonist and a love interest. This story 100% works, but it wouldn't work in a story with two equally important love interests (who is the male lead?) or a story with two protagonists who each have their own love interest. Or a story with two gay guys who are both equally the protagonists and the love interests.
But those are complex stories. Most stories (including this one) are very simple: It has a female protagonist and a male lead.