The master realm of urban madman is divided into star realm. Astral world is the primary realm where practitioners have just stepped into the gate of martial arts. Its characteristic is that there is a weak truth element running in the body, which can help them improve their physical fitness, but their strength is weak. "City Madness" is an online novel, and the protagonist is a boy named Yang Kai. In the novel, the protagonist constantly improves his strength and realm through cultivation.