The former special forces soldier {Dark Wind}, because his comrades were tortured and killed by evil forces, he transformed into a mysterious killer codenamed "Martial Demon", stalking the darkness of the city and killing evildoers. His martial arts are strange and powerful, and he never hurts innocent people. However, on the way to revenge, he discovers that there is a huge conspiracy behind his target that endangers the safety of the city. From pure revenge to active protection, An Feng wears darkness as his clothes and martial arts as his blade, wandering on the boundary between good and evil, while tracing the truth behind the death of his comrades, while secretly dismantling the conspiracy of the evil forces. This lone guardianship battle will eventually clear away the haze of the city and restore peace to the world in the name of the martial arts demon.
