Fei Xiaofu is from the TIC planet. To be precise, she is a system invented by a scientific research team on the TIC planet.
The TIC planet and the earth Fei Xiaofu is going to are located at the same location in different spaces. The reason why the scientific research team invented Fei Xiaofu is because the lives of some people on the earth are too depressing, and the strong resentment they unknowingly break through the confinement of space and affects the normal operation of the TIC planet.
Fei Xiaofu's mission is to temporarily enter their bodies and use her ability to change their current situation and reverse their lives.