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.

An aspiring singer Sun-deok is visited by her mother, whom she hasn’t spoken to in years. The abrupt encounter leads to the news of her younger sister Yuri, who had vanished with their savings. The mother-daughter team is now hunting for the missing girl and their money, poking around in Itaewon, the international hub of Seoul. Little do they know that soon they will be faced with Yuri’s unlikely secrets.

Chul, Seop, and Deok-kyu are desperate for just one performance, but even being on a club stage is hard. Im-jae, the freewheeling leader of the band always disappears. Deok-kyu who makes a living with rap wants to play only the blues, but people no longer listen to it. Near the end of the year, they go for a live club audition yearning for a chance. While enjoying their different performances, we meet the diverse realities those musicians face.​