Heo Soon-Ae is a 40-year-old homemaker devoted to her pilot husband Yoon Il-Seok, their son, and Il-Seok's mother who lives with them. But one day Soon-Ae discovers that her husband has been cheating on her with a 28-year-old flight attendant, Han Cho-Eun. Cho-Eun confronts Soon-Ae to convince her to divorce Il-Seok so she can take her place. The two get into a car together and drive towards the airport where Il-Seok is due to arrive from a flight; the plan is to show up in front of Il-Seok together and ask him directly who he wants to be with. The plot turns supernatural, however, when the two women fall victim to an accident that switches their identities; Soon-Ae becomes trapped in Cho-Eun's body, and vice versa. Since they can't seem to change back the two must learn to live in each other's body, posing as the other woman.