Hyojin teaches children in a study room business that she runs with a friend in the suburbs. One day, she is asked to take care of Jonguk, the son of her dead husband and his ex-wife. It is not an easy burden to bear, but she finally decides to keep him. Then she finds out that Jonguk is searching for his mom, and doubt is cast on her previous belief that the ex-wife is dead. On a snowy winter night, Hyojin and Jonguk visit his mom together. It is not often that a 32-year-old woman and a 16-year-old boy come to live together. Though they must become mother and son, they are strangers, and becoming a family is not easy. Unlike home, where the boy is trying hard to become part of the family, Mothers is a story about a woman trying to become a mother and a friend. Director Lee Dongeun dreams of giving birth to another family following In Between Seasons. (NAM Dong-chul)