Jeong Gu-won is a real demon and he makes deals with people. In exchange for one of their wishes, they must sign a contract stating that in 10 years they will go to hell. You are a successful actress and you have many enemies. You got into trouble and ran through dark alleys, from a man who wanted to kill you. You were in despair, the killer’s steps were approaching... but then a guy appeared in front of you. You ran to him to ask for help. He said in a cold tone. "I can save you but you have to sign the contract." A piece of paper appeared in his hand, it seemed to be a contract.