Daisy (Jamie Lee Curtis) is a psychiatrist and a single mother who raises her daughter Anna (Lindsay Lohan) and young son alone. But Daisy and Anna have always had a bad relationship, and neither of them can stand each other's behavior. They quarreled again that day: about Anna's band and her mother's remarriage, saying that if it were the other party, things would have a better result. Unexpectedly, after reading a small note given by a strange old woman, they actually exchanged identities. In fear, they had to accept the facts and cooperate with each other to do their own things. The things they experienced during this period made the mother and daughter realize their own lives and understand each other's feelings. But Daisy's wedding is about to take place, and her identity cannot be changed back...