In My Demon, a 200-year-old demon, Jeong Gu-won (Song Kang), unexpectedly falls in love with Do Do-hee (Kim Yoo-jung), a chaebol heiress. Their contract marriage leads to comedic and romantic entanglements as Gu-won loses his powers, forcing him to protect Do-hee. Together, they navigate challenges, ultimately discovering love amidst chaos.
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