If the pain cannot be solved, the person who produced the pain will be solved. Xiaoer thinks every day that he can disappear from the world painlessly or not exist.
One day, Ying Zheng, the fierce man carrying the system, finally succeeded in renewing his life, time-traveled into Xiao Er's body, replaced Xiao Er, became the body's master will, and lived a wanton life in modern times!
Concept: The body composed of billions of cells is trying to survive