Jiang Qin is a professional killer who died unexpectedly while performing a mission. When she woke up, she found that she was inexplicably bound to an inexplicable system. The system told her that she needed to go to many dimensions to fulfill the wish of a female partner with a tragic ending. After completing the task, she could be sent back to any point in time in the original world. Because she wanted to go back and save her miserable childhood, Jiang Qin agreed.
So there is everything that follows.