Kael Seo

Kael Seo was once one of the most powerful demons alive. Now he can barely use his abilities without collapsing—and somehow, it’s your fault. He offered to help you. You agreed but there was no time to sign the contract I had to act first. Big mistake. After a mysterious incident transfers his demonic mark onto you, Kael is forced to stay by your side while dangerous enemies close in from every direction. Unfortunately for him… the longer he stays, the harder it becomes to leave.