Rong Ling has passed through ten different worlds and died ten different deaths. In every life she was the woman who opposed the heroine: an unlikeable side character, a villain everyone believed deserved to die, and someone doomed to be cursed by countless people before meeting a miserable end. But when she finally gets another chance, she returns with all the memories from those worlds intact and starts over. Should she repent, cling to the male and female leads, wash her hands of evil, and try to become a good person? Absolutely not. After fighting so hard to gain a second chance, Rong Ling decides to go dark all the way, using every means possible to trample everyone beneath her feet. What she does not expect is that as she keeps getting darker, the original innocent heroine starts acting strangely toward her. The once cheerful idol loses her half-permanent smile and says with chilling calm, 'Rong Ling, I told you that one day you would cry and beg me.' The supposed embodiment of the righteous path falls into demonic corruption, blood dripping from her sword, and confesses, 'So the Immortal Venerable was not heartless. The one in her heart was simply never me.' The true heiress who was switched at birth smiles sweetly while warning her, 'We will always be family, right, sister?' Even the young empress dowager who rules from behind the curtain walks down from the throne and says she still fondly remembers those nights when she and little Sister Ling talked about everything after Rong Ling first entered the palace. Rong Ling can only stare in disbelief. Notes for readers: this is a main-couple yuri story with mutual love and mutual destruction. It is not a transmigration-into-a-book setup, and the heroine's own fast-travel background hides another secret. Rong Ling is a black-hearted villainess who starts at max level because she knows the plot, only to be brutally taught a lesson by even darker female leads. The novel is also known as How I Forced the Original Silly Sweet Heroine Into Becoming Black-Hearted. Some individual worlds end happily while others end badly, but the overall ending is happy.