"My Mom, My Ping Pong" begins with ten-year-old Yu Cheuk Wing, who is passionate about table tennis. Cheuk Wing’s skills keep improving as her coach Kwok Yat, who has come to Hong Kong through the Quality Migrant Admission Scheme, takes care of her. Cheuk Wing hates losing, and she is depressed as she suffers defeat. Moreover, she and her mother, Kong Chi Yan, are drifting apart as they do not really understand each other.
Cheuk Wing is then reprimanded by Kwok Yat, and she is so frustrated that she declares she does not play table tennis anymore. Chi Yan offers her encouraging words but in vain. The duo contradict each other even more. To help Cheuk Wing overcome hurdles, Kwok Yat wants her to train Chi Yan to become a satisfactory table tennis player in one day.
Cheuk Wing takes up this impossible task. Cheuk Wing uses the allure of table tennis to get closer to Chi Yan gradually. She also understands her mother and coach’s support is her strong backing.