Two men unexpectedly get a peculiar mission to take care of an 11-year-old kidnapped girl.

Yoon-Hee lives with her teenage daughter Sae-Bom. On a winter day, Sae-Bom finds and reads a letter addressed to her mother, sent from Otaru, Japan.

Six years after her son went missing, dedicated mother Jung-Yeon still hasn’t lost hope – even after her husband’s shocking accident while rushing to follow up on a potential sighting….