Shen Xiulan, a widowed woman, is driven out of her home by her husband's family along with her daughter Xiaoman. They board a slow green train to rely on her maternal family, and on the way, the daughter suffers from a high fever. Conductor Lu Tiejun extends a helping hand and attentively cares for them along the journey. Afterward, Xiulan goes through numerous hardships, including harassment from her maternal family and demanding her late husband's compensation. Supporting and cherishing each other, the two break through secular prejudices and finally reap a stable and happy life.