After I Transmigrated, Even the Extras I Played Became Protagonists

After Yi Kongqing, a soon-to-be graduate, suddenly died in the early hours of the morning on the day of her thesis defense, she unexpectedly became bound to a System. To stay alive, she has to travel to various bug-ridden minor worlds and play the missing passerby roles, keeping each world running properly.

But as she keeps acting, the stories start taking strange turns. Still, she manages to complete her missions every time.

World One: The Drowned Girl in a Period Novel

You can skip the first world. It wasn't written very well.

World Two: The Rich Girl in a School Story