Quick Transmigration: The Sweet, Fragile Cannon Fodder Gets a Harem-Lover Script

[Quick transmigration Mary Sue + sweet, soft, airheaded beauty + adored by everyone + one-sided crushes and a chaotic battle for her affection + multiple male leads, all devoted + mostly love at first sight] Shen Nian'an died of a heart attack and was chosen by the Cannon Fodder System 778. 778 told her that in many small worlds, cannon-fodder characters were unhappy about existing only to highlight the main characters or serve as stepping stones for them. As a result, many characters had gone on strike. Her mission was to play the striking cannon fodder and see the story through. It also told Shen Nian'an that the cannon-fodder scripts were simple: as long as she followed the plot and earned enough plot points, she could come back to life in her original world, and it would even cure her heart condition. The girl, who had suffered from illness ever since she was born, heard this and eagerly agreed, her eyes sparkling. Who could have guessed that the male and female leads, and even the supporting male characters, would all cling to a little cannon fodder like her, completely ignoring the script? World One: The fake heiress who is cannon fodder in a story about real and fake heiresses Su Nian'an diligently follows the plot, doing her best to act spoiled and wicked, but she discovers that the main characters are looking at her more and more strangely. World Two: The doomed cannon-fodder first love in a substitute romance World Three: The extremely insecure, bullied cannon-fodder passerby in a school story... (The worlds mentioned in the blurb may appear in a different order. The order isn't fixed.) Content warning: The heroine is a sweet, soft beauty, a little spoiled with a bit of cleverness. She's not a strong female lead! The male lead is an obsessive, unhinged yandere, and the story may include coercive romance. Please leave if that's not for you, and don't send hate. Thank you!