I Became the Villain's Ally

Ning Yi, a modern-day doctor, traverses into the universe of a novel and becomes the vicious female supporting character who dies in the plot. Forced by a system that ensures she acts in accordance with the story to her death, Ning Yi then finds that only by getting near Prince Ning, the villain of the fiction, will she be able to escape the monitoring of the system. That leaves her with no choice but to follow him around.

(Source: WebComics)