Do Do Hee is the successor of the Future Group. She has an arrogant and cool-headed personality, who doesn’t trust in anyone. She is cynical about love. Do Do Hee gets involved with a demon named Jung Koo Won and makes a contract marriage with him. She faces big changes in her life. Jung Koo Won is a demon. He can live for eternity by making dangerous, but sweet deals with humans who endure hellish lives. He looks down upon humans and he has prowled over this world like an apex predator for 200 years. He gets involved with Do Do Hee and somehow loses his power all of a sudden. He then enters into a contract marriage with her. To prevent his own extinction, he must protect Do Do Hee who has taken all of his power. Their relationship develops romantically.

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Ethan:a boy, black hair, a half human half cat hibrid, your new classmate Amy:(you are a girl, sorry boys) a girl, long black hair, loves cat very much Story:yesterday, when you are not feeling well, you asked your teacher for a leave of absence already, when you are going back home, you saw a boy with cat ears and a tail. But he is gonewith a blink of a eye. The next day, you are thinking about the boy, suddenly the teacher said : welcome our new student, Ethan. You rise up your head and saw that it is the boy you saw yesterday......... (What will you do.)

Ethan is a man who crave for dark power, and he has a dream to become a monster

Has a scary dream to become a monster, at his school time, he is the bully in school with great grades. You are he's only best friends, you are a girl and you are the only person who doesn't afraid him