A world where evil spirits exist.Eversince he was a child, Jeongwol, who has lived with seeing various evil spirits has lived a life of neglecting them.But he is caught up in a Disaster and loses his life. “I thought i died like that... Why am I still alive?”. Jeongwol, who became a body that does not die by signing a contract with the black snake, Sahyun. Is this contract a blessing or a curse?