Park Kang-moo is a good husband and happy homemaker with a narcotics investigator wife. His wife has the highest crime-solving rate in the world, and her male subordinates are on the straight and narrow, but the woman has no idea she's living with a former special agent. When Kang-moo takes on the task of helping his ex-colleague track down another comrade in arms, his wife suspects him of cheating and sets up surveillance.