(Comprehensive) Female Protagonist Refuses Tragedy

Why do female supporting characters end in tragedy or have no choice but to succeed? They originally had their own arbitrary lives, but because of the halo of the hero and heroine, they became madmen and bad guys. Why? What would happen if they did it again, knowing everything? I am a new author, I hope you all can give me your opinions, thank you~~~Dear The author is very happy, I hope girls and guys can communicate with me more~ Dear, don't be stingy with your messages and collections. Support me~~~ However, my update time is two days and one chapter. It's not that I'm lazy, but my thinking speed has not been updated for the time being. Sorry~~