In front of the court in winter, a divorce mediation broke into Xiaoxing and Xiaoyang's childhood - after their parents divorced, they were forced to live with their mean aunt, their mother became the "unmentionable name" in the family, and their father went away to work in another country. During the days when they were living under someone else's roof, their aunt's control and grandma's prejudice were as biting as the cold wind. The pink sweater secretly sent by their mother became the brother and sister's only warm thought, but it also triggered the outbreak of family conflicts.
In order to find her mother and escape from the oppressive life, fourteen-year-old Xiaoyang secretly saved money and planned a route. Ten-year-old Xiaoxing resisted injustice with silence and hid her longing for her mother in drawing papers and composition books. Escape in the middle of the night, worry on the train, and rush on long-distance buses, the brother and sister hold on to their only address and protect each other on the unknown journey. This is not only a journey across the city to find their mother, but also the growth path of two children carrying each other on their young shoulders in the cold winter, trying to heal family rifts and find love.
