One night, the Empress gave birth to their youngest son, Jungwon (known as the God of War). He is more powerful than his siblings which makes them jealous and proud. One day, as the Empress and Emperor were sleeping they were attacked by some civilians and killed them (including his siblings) all. Jungwon is the only person who survived from tragedy. Years passed by, and Jungwon now a teenager, went to the mortal world alone and disguised himself as a normal human being to look for his enemy.