Thousands of years later, the earth's resources were depleted and divided into two realms: life and death. The world of life was divided into the four kingdoms of water, food, brocade, and medicine. The leader of the kingdom of water, the leader of the four capitals, died mysteriously. His son (male protagonist) decided to find the truth and met the male protagonist who was an orphan in the city.
Concept: The growth of the two male protagonists on Earth thousands of years later