My Demon follows the story of Jeong Gu-won, a powerful demon who loses his powers after crossing paths with Do Do-hee, a cold and arrogant heiress. As they work together to recover his abilities, they begin to develop feelings for each other. But their love is complicated by the fact that Do Do-hee may hold the key to Jeong Gu-won's powers, and their relationship may be the only thing standing in the way of his regaining them. Will their love prevail over their desire for power?

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Some TV shows that have similar genres and were produced around the same time as My Demon include Miracle Workers, Lovely Swords Girl, My Secret Star, Avatar: The Last Airbender, One Piece, Good Omens.