Looking for a manhwa(?)

The main character was an actress for stage plays, and typically played the role of villain. Her 'rival' had blond hair (though I'm not too sure about that) and was popular, typically starring as the heroine. I don't remember if it was GL or not, and there might have been a psychological tag. I think the gist of the story was about the relationship of the two girls, though I don't remember if they were competing or cooperating.