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 finds out her husband has been cheating on her with a 28-year-old flight attendant Han Cho-Eun. The news shocks Soon-Ae and she cannot believe it, but the mistress, Cho-Eun, wants to convince Soon-Ae, because she wants Soon-Ae to divorce Il-Seok so he can finally be with her. So the two get in the car together and drive towards the airport where Il-Seok is due to arrive from his flight; the plan is to show up before Il-Seok together and ask him on the spot who he wants to be with. But their plan turns supernatural when the two get into an accident that has them switched; so Soon-Ae is now trapped in Cho-Eun's body, and vice versa. Since they can't seem to switch back, the two must learn to live in each other's body, as each other, and things get really complicated when the real Cho-Eun's ex-boyfriend, Hyeon-Woo, tries to win Cho-Eun back.