Mira in her late 40's has been living in Paris for around 20 years. Having just divorced her French husband, she decides to visit Korea, and meets her old friends Young-eun and Sung-woo. While having a cheerful time in the bar, Mira goes to the toilet and after she returns, time is reversed back to 19 years ago. It is the day of Mira’s farewell party, before she left to France.