Shadow under the moon

Summary

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 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?