Li Er, a 17 year old girl who has great difficulty hearing out of her left ear, is rejected after confessing her love to a boy, Xu yi. Instead the boy is in love with Li Bala, a girl who is in fact in love with Zhang Yang. Li Er befriends Li Bala, who dies due to an accident. As the movie progresses, Li Er overcomes her hatred of Zhang Yang, whom she blamed for Li Bala's death.

The film is based on a true story, inspired by the touching real-life events of the 1993 (01) class of the Fruit Tree Department at Hebei Agricultural University, whose students took care of their late classmate’s parents for 15 years. After the sudden passing of Li Baoyang in his youth due to illness, his classmates—unrelated by blood but bound by love—make a lasting promise to honor his memory and care for his aging parents as their own, embodying the spirit of “treating others’ elders as one’s own.” Their 15-year journey of devotion is tied together by a bet between Liu Qu’er, a man hardened by life’s harsh realities, and a village chief who still believes in kindness and trust. Though Liu Qu’er ultimately loses the bet, he stands on stage singing, “A promise worth a thousand gold.” This moving story of commitment and compassion became a symbol of “Good Deeds in Hebei,” echoing across the land and warming countless hearts.