Quick Transmigration: The Cannon Fodder Female Lead Saves Herself

[Quick transmigration + System 110 + special items + romance or going solo + saving supporting female characters]

In the modern world, scientist Fu Jingjing dies suddenly from prolonged, intense work, and her soul arrives in the underworld.

The underworld has introduced a special policy: anyone who helps those who died unjustly change their tragic fates and earns enough merit points can return to their original world.

Fu Jingjing is assigned a civil service post in the underworld and receives assistance from System 110. She can exchange points for items, learn in advance how someone will be harmed, and use other abilities to save the female characters and set their lives back on their proper paths.

First world: The illegitimate daughter of a marquis's household is married off in place of someone else to a disgraced prince, Mu Yicheng. Romance is possible, or she can go solo.

Second world: A village girl in the 1970s and the village hunter's son.

Third world: A modern-day fake heiress who was switched at birth. Going solo.

Fourth world: In a cultivation world, a legitimate daughter with a single spiritual root has it replaced with a mixed spiritual root.

Going solo.

Later... a vampire, a pitiful girl in the apocalypse, an ancient maid... After the tenth plane, she returns to her original world to live a life of her own...