Shadow under the moon

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?