The story starts from a modern vegetable market, and the core setting is "Salted Fish Time Travel".
Three panda-headed workers traveled through various dynasties in ancient China (Qin→Warring States→Three Kingdoms→Tang→Song→Yuan→Ming→Modern) because of a 5-yuan salted fish. In every dynasty, there are stone tablets that leave traces of those who traveled through them. The stone tablets connected in a line are the dragon veins.
