Actress Im Se Ra is over the moon after becoming the youngest winner of the Best Actress award in 1999. That very same night, she is hit by a lorry and suddenly wakes up 25 years later in the body of Bong Cheong Ja, a middle-aged woman. Determined to return to acting and find out what happened to her, she is joined by Dokgo Cheol, a former homicide detective who has been demoted to the traffic police. Working together, Cheong Ja and Cheol uncover a mysterious link from the past that could change both their lives.