They are like twins, but one belongs to darkness and the other to light.
Seventeen years ago, he spent his whole life in eternal darkness in exchange for his salvation.
For seventeen years, he planned step by step, risking his life, and finally obtained the token that unlocked the shackles. But he never thought that he had already made a life-and-death contract with the devil.
Blood and tears intertwined, the decisive battle is imminent, when the final elegy has been sung, can they win the roulette of fate?