《My Demon》 tells the story of a cohabitation romance in which a chaebol heiress and a demon who lost his powers overnight redeem each other.A fantasy romantic comedy about Do Do-hee, a chaebol heir who looks like a "demon" wearing Hermès, and Goo Won, a "demon" who lost his powers in a moment, after a contract marriage.

Do Do-hee (played by Kim Yoo-jung), the chaebol heiress, looks arrogant and elegant like a salt latte between sweet and salty, but in fact she is a character with the temperament of a madman.

Do Do-hee, the future group heir and devil-loving man that no one can believe.Do Hee, a foreigner from the Future Group, understood the truth of the world very early and became very calm.Cynical about love, she signed a contract with the "devil" Zheng Guyuan (played by Song Jiang), and ushered in changes beyond her imagination.It is curious whether the demon that appears in front of her surrounded by enemies is a rescuer or a destroyer.She will show the "sweet and salty" charm of Do Do-hee who is mean but gentle, weak but strong as a "salt latte".

Jung Goo-won (played by Song Kang) is a man who is as hot as iced coffee (an oxymoron). Although he is a superior being than human beings in all aspects, after losing his ability, he will and DodoXi worked together to regain his lost abilities.A flawless, deadly demon.He uses his soul as a guarantee to enjoy eternal life through a dangerous and sweet deal.Believing that humans are insignificant, he has been the top predator for more than 200 years and became entangled with a very strange woman "Do Do Hee", and instantly lost his abilities.In order to prevent him from disappearing, he had to protect Do Do-hee who was snatching away his abilities.