Lee examines and questions human nature, which affects the destiny of human race in his stories. In "Dragon Raja" series the human race is defined by its power and will to cause change. While other races like elves, dwarves and dragons are defined by their characteristics and strength, they are described to lack the ability to change as humans do. Thus human race is empowered to change the world (in human-centered ways) and to cause its time to go on. This power the humanity has over the world is explored in "Future Walker". In "Polaris Rhapsody" Lee incorporates the humanity's desire for revenge and for freedom in feudal conflicts and pirate wars. This conflict of revenge and freedom also involves Highmasters of Pandamonium, similar to Seven princes of Hell, who cast a vote to decide the human race's destiny.