After a disaster, most people in the world had color collectors and color exchange systems.
There are six color grades:
Level III, Level II, Level I, Level A, Level B and Level C.
The more colors collected, the higher the level. In order to protect everyone's color energy, the world has established the Global Color Assurance Association, referred to as: SVI.
Production supervision bureaus have been established in every city in every country to protect personal color storage and city colors.
There are criminals who steal other people's colors, and these people are collectively called color bandits.
Concept: science fiction