Cha Sun-Hee (Lee Da-Hae) is a housewife and she is married to Bong Cheon-Dae (Bae Soo-Bin). Her husband is currently unemployed. She has a twin sister, Cha Do-Hee (Lee Da-Hae), who works as a flight attendant. Although they are identical twins, they have completely opposite personalities. Cha Do-Hee becomes involved in a situation which leads to Cha Sun-Hee pretending to be her flight attendant sister. She then meets co-pilot Song Woo-Jin (Ryu Soo-Young).
Backdrop for the drama series is set at a small police station. Moo Goong-Hwa (Lim Soo-Hyang) is a former boxer. After the death of her husband, she has raised her daughter alone. She now works as a police officer. Cha Tae-Jin (Do Ji-Han) is an elite police officer who graduated from the police university. He is full of justice.