On a rainy night in Busan, So-young leaves her baby outside a baby box, a safe place set up by Korean churches for new mothers to leave unwanted infants. Instead, he’s taken in by Sang-hyun and his business partner Dong-soo, who run an unofficial adoption brokerage. Realising her baby has been taken, So-young tracks them down and when they tell her everything, she decides to join their search for a new family for the child – unaware they’re being tailed by two detectives. Brought together by chance, the five individuals embark on an unusual and unexpected journey in the outstanding new film from the acclaimed director of Shoplifters.