As we all know, black and white are the best partners.
Underworld Rich List
List 1: Lord Yama
List 2: Judge
List 3: Black Impermanence
………………
List 108: Bai Wuchang
Xiaobai:……
Xiaobai: Why are you richer than me even though we are both impermanent????
Xiao Hei smiled evilly (no): Be good, what's mine is yours.
Purpose: Affectionate companionship can withstand the long years