Sisters moving from Hunan to Hong Kong in the 1990s are faced with an identity crisis, poverty, and their father's drug addiction.

Mommies tells an emotionally compelling and complex story of two interwoven mother-and-son relationships. Sally works as a hostess, a kind of life her unruly son Keith loathes and from which he seeks refuge through self-harm. Keith looks with longing for the seemingly happy and loving relationship between mentally-ill Mandy and her son Luke. Yearning to become part of the other family, Keith wishes Mandy were his mother instead. But will that ever be possible? The sympathetic Mandy and Luke try to help Keith, and when they think things are looking better... Subtly told, Mommies captures the human condition of Hong Kong people’s lives seldom seen.

Ching became the laughingstock on the Internet. In order to let her mother experience her own predicament, she sought help from the Rescue Office, vowing to make it her goal to play a prank on her mother.