When a judicial apprentice goes behind bars while on an undercover job, he plays the hand he’s dealt to survive prison and get his payback.

Once a legendary detective and a new mom, Mi-young, now works a desk job. But when overenthusiastic newbie Ji-hye is assigned to Mi-young's civil complaints team, the two female cops get caught up in a serious criminal case that triggers an action-filled comedic investigation.

Ji-woong is a loser who can't find a job so he lies to his mother for money, but one day she abruptly cuts him off and he becomes homeless. That same day, salvation arrives in the form of Hong-sil who's extremely stingy. Her hobby is visiting the bank to make savings deposits, and her specialty is selling empty glass bottles and old newspapers for cash.

Jo Pil-seong, a rural detective with a gambling addiction, is on the brink of losing his job when he has his gambling winnings stolen by an escapee convict. Jo Pil-seong sets out to catch the fugitive and retain his money and dignity.

The sudden death of her mother brings Myung-eun back home to Jeju island. There she meets her estranged sister Myung-ju and Myung-ju's daughter Seung-ah, still living at their old home, and Hyun-ah who has lived with them for over 20 years like a relative. A career woman whose hard exterior masks her illegitimacy and abandonment issues, Myung-eun tells Hyun-ah she wants to start looking for her father after the funeral. Single-minded in her desire to dig up memories of her father and discover why he left, Myung-eun resents that Myung-ju, who like their mother is a carefree fish trader and an unmarried mother of a young daughter, seemingly doesn't care. At first Myung-ju is reluctant to accompany Myung-eun, but after Hyun-ah persuades her, guilt and her sense of duty as an older sibling prevails. And so the two sisters who are dissimilar in character...