Quick Transmigration: Cuddling Up to the Gorgeous Cannon Fodder Sister

Main plot: Jiang Wanqing has grown numb to death after clearing one terrifying dungeon after another. During a dungeon mission, she becomes bound to a System. Its task is to send her to various small worlds to do evil in place of villains who have run away. The System tells Jiang Wanqing the laws governing each world, and, numb to the horrors of these worlds, she agrees to the System's contract.

And so she begins traveling between worlds.

World One: She plays the vicious fake heiress, but what's with the male lead's aunt? Why is she clinging to her?

The vicious fake heiress vs. the cannon-fodder aunt who dies young after stepping aside for the male lead

World Two: She plays the Demon Cult's saintess, who seeks revenge after the male and female leads wipe out her family. The person she casually picks up is the righteous Beiling Immortal Lord, a demon-slayer dedicated to defending the Way. She's lost her memory, fallen in love with the Demon Cult's saintess, and wants to join forces with the righteous cultivators of the world.

The revenge-driven Demon Cult saintess vs. the righteous Beiling Immortal Lord

World Three: She plays the celebrity fiancée of a lovesick male lead, who turns dark after his love goes unreturned. What's with the lackey by her side? Why are they so clingy?

The fiancée of a lovesick male lead who turns dark when her love goes unreturned vs. the jealous lackey who sticks by her