The Unfulfilled Regret System [Quick Transmigration]

The story of an unexpectedly deceased screen queen who travels through different worlds to soothe the regrets of those who cannot let go. World One: A fake best friend pretends to deliver a love letter, but is really trying to steal the girl's man. World Two: A highly capable but insecure senior apprentice sister is manipulated by a junior fellow disciple. World Three: The daughter of a martial arts alliance leader who can't use martial arts. Chi Tongying, after accepting the mission: Heh, our goal isn't just to make sure the original host no longer has regrets. We also want the people who wronged her to think of her and regret everything! The System, in tears: Boss, calm down! Keep this up and the world's total regrets are going to exceed the limit! Note: The female lead is not a good person, not a good person, not a good person. She only cares about completing her mission. Theme: Good and evil both meet their just deserts.