After being condemned to death by poison for her notorious reputation as Joseon's most feared femme fatale, Kang Dan Sim expects her story to end. Instead, she awakens centuries later in the year 2026, inhabiting the body of Shin Seo Ri, a struggling actress whose career has yet to take off.
Confused by the modern world and still carrying the mannerisms, beliefs, and fierce personality of a woman from the Joseon era, Dan Sim struggles to adapt to contemporary life. Her unusual behavior soon draws attention, especially when she crosses paths with Cha Se Gye, the arrogant and wealthy heir to the powerful Chail Group conglomerate.
Believing Seo Ri's bizarre actions and old-fashioned speech to be an act, Se Gye finds himself repeatedly entangled with the mysterious woman who claims to be from another time. As their worlds collide, unexpected sparks begin to fly, forcing both of them to confront their assumptions about love, destiny, and second chances.
Blending romance, comedy, fantasy, and time-travel elements, My Royal Nemesis follows a notorious Joseon-era villainess who gets a surprising opportunity to rewrite her fate in modern-day Korea.