Complexity and diversity of human nature. The Promise King is a character in the novel The Journey to the West. The infinite king in the novel The Journey to the West has some shortcomings, for example, he believed the monster's lies, which led to his injury by the monster, and he did not take effective measures to protect himself and the country in time after being injured by the monster. Therefore, the infinite king's behavior and personality satirize the complexity and diversity of human nature.