Bai Jingyi traveled through time and came with System 520. If you want to travel back in time, just travel back in time, and it happened to be during the Republic of China. It's not a fantasy, it's history. Bai Jingyi had no choice but to live well in this world. Unexpectedly, there are still tasks.
After going through all kinds of difficulties, the task was completed. Finally returned to the original world.
Concept: The cruelty of war