A romance comedy centered on a love-hate relationship between Sin Seo Ri, a legendary villainess from Joseon, and Cha Se Gye, a ruthless modern-day chaebol. Sin Seo Ri, a nameless actress who becomes possessed by the spirit of a notorious Joseon-era femme fatale, gains a vicious personality. Once a royal concubine of the highest rank who was called a national seductress and sentenced to death by poison, her soul is transported to the 21st century, where she begins a new life.