(This story has a couple.)
Chang Li was a top-tier powerhouse who had weathered every storm and seen just about everything. But while carrying out a minor mission, she was outsmarted and caught off guard. With no other choice, she took her opponent down with her and died.
Instead, she was bound to a System, and from then on began helping people fulfill their wishes.
These people had been forced into the role of cannon fodder for all sorts of reasons, including but not limited to competing with the protagonist for power, getting in the protagonist’s way, or refusing to serve as a stand-in for the protagonist’s true love. And now Chang Li had become one of them...
They say that many years later, legends of a certain hardcore mission-taker spread throughout the myriad worlds.
