Mira in her mid-forties has been living in Paris for more than twenty years. Having just divorced her French husband, she impulsively decides to visit Korea and meets her old friends Young-eun and Sung-woo who had lessons of play 20 years ago. While having cheerful times in a bar, Mira goes to a toilet and when returns, time has reversed twenty years. It is the day of Mira's farewell party before she sets off for France. Before figuring out whether this is all Mira's illusion or not, she goes through a series of mysterious reversing time sip.