When the protagonist was young, an accident made him the subject of a secret experiment. The experiment changed his body and his destiny, but he managed to keep it hidden and live an ordinary, low-profile life. Yet fate is full of surprises. A series of sudden events shatters his peaceful existence, forcing him out of the shadows to face his past and future. Along the way, he meets a like-minded friend and brother. Together, they endure life-and-death trials and fight side by side against the forces of darkness. Their friendship deepens with every battle, and they become each other's strongest support. Later, he discovers that the secret within him is far more complicated than he imagined, and begins to explore his abilities.
