Johan Kim is an ordinary 19 year old who loves basketball and hanging out with friends though there is one unique thing about him, his family are all exorcists and demons are real. But they have been hiding this from Johan his entire life. When his parents die suddenly and his grandpa confesses the truth to Yono he goes running and gets attacked by demons. Now that Johan has realized this other world, will he accept his destiny and fight for humanity to ignore and go back to living his normal life. Long ago demons roamed the earth freely, terrorizing humans. Humans were on the brink of extinction when a group of exorcists rose up and pushed the demons back to the demon realm. Johan kim is part of this long line of exorcists called Guardians but he does not yet know it. Will he remain unaware and perish alongside the rest of humanity or will he discover his true power and save the human realm from the incoming demon invasion?