Su Jin, a university student whose body frequently suffers strange afflictions and who can only end up confined to a hospital bed, is inexplicably summoned to a mysterious meeting: a malicious gathering intended to spread evil.
Unexpectedly, when the meeting ends, Su Jin does not return to his original world. Carrying a power called Sin Inheritance, bestowed upon him by the meeting, he arrives in a new environment, a world where supernatural phenomena are already common knowledge.
Just as he accepts this reality and thinks his misfortune has turned into a blessing, giving him a healthy body, he suddenly discovers that someone among the others who attended the meeting with him has already been around for nearly a century and become a legend.
Within a month, he too truly becomes a Sin Inheritor: Chaos.
A bit like Toka