The legendary warrior of the French Foreign Legion, Kang Chan! Feared by his enemies and revered on the battlefield, he was known as the “God of Blackfield” during the African war. His name struck terror into those who opposed him.

But during a critical mission to eliminate Masallan—the mastermind behind SISS, a Sunni extremist group—Kang Chan was fatally shot by an unknown bullet from behind. As his vision blurred, he watched helplessly as his thirteen loyal comrades, who had placed their unwavering trust in him, were slaughtered one after another. Betrayed and left to die, he awaited his end.

Yet fate had other plans. A mysterious force intervened, pulling him back from the brink of death. When he opened his eyes three years later, he found himself in South Korea—but in the body of a different Kang Chan, a 19-year-old high school student tormented by bullies.