(Transmigrating into men, women, animals, and plants + no fixed pairing + protagonist's soul is female + innate superhuman strength + spatial golden finger)
Nan Yue died, and then Nan Yue came back to life. While shopping at a mall, she overheard two men arguing over a woman. Curious, she went over to take a look, got hit by accident, crashed through a glass partition, and fell to her death.
After dying, she was bound to a cannon-fodder System. Only then did she learn that the world she lived in was just a book. Because the book had many readers, their collective willpower had made it into a small world of its own. Every book has its protagonist, as well as supporting characters and cannon fodder. Unluckily for Nan Yue, she was the cannon fodder. And there are cannon fodder like her in every small world.
The cannon fodder's fate was a plot devised by the author, but once the novel became a world of its own, they came to life and naturally refused to have their fates dictated this way. So the cannon fodder banded together, bringing their small worlds to the brink of collapse. The god who governs the three thousand worlds could not bear to see these newly born small worlds fall apart, and so the Cannon-Fodder System came into being.
Nan Yue's mission is to replace the cannon-fodder character with the greatest resentment in each small world, change the original character's fate, live to a ripe old age, and die peacefully.