Nothing

The rampant spread of a virus has turned most humans into grotesque beings called “the Rotten.” Amidst the ruin, Seonho leads a small group of survivors and protects his companion Haesoo, who is bullied for being weak and timid. Seonho’s group is thrilled to meet more survivors with a large stockpile of supplies—until they realize that this new group is shockingly barbaric and cruel. By far the most twisted is their leader Won, who has his dangerous eyes on Seonho. Determined to shield Haesoo, Seonho makes a deal with Won... but will any of them make it out alive?

A world where evil spirits exist.
Since childhood, "Jungwon" has lived with the ability to see various evil spirits. Although he has tried to ignore them, he gets caught up in a mission for the <Disaster Department> and loses his life. He was sure he had died... so why is he still alive? Through a pact with the black serpent "Sahyeon," Jungwon has become immortal.
But is this contract a blessing, or a curse?