Xiao Gong, who just wants to live a good life and has no interest in having buns, vs. Xiao Shou, who always wants to have buns and contribute to the continuation of mankind
Primitive times: Xiao Gong was lying outside the cave basking in the sun, but Xiao Shou always wanted to drag him into the cave to make buns.
Feudal society: A little boy who envies others having babies insists on having babies.
Other worlds to be determined...
Purpose: Enjoy life leisurely