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This is a movie about two people (Gigi Leung and Takeshi Kaneshiro), who are destined to be together but by some twist of circumstances they never find each other.

Despite happy appearances, Mr and Mrs Man are a quarrelling couple. Each keeps telling the other how much they have sacrificed for the family, not realising that their fights have been witnessed by their five-year-old daughter, Kei. One terrible day Mrs Man runs away. Mr Man then finds her in a park. The wall that divides them seems to be coming down.

Melanie returns to Hong Kong as filmmaker-in-residence at a university after living abroad for decades. She tries to redefine her cultural roots and affiliations, partly through the adventure of a tragic-comic romantic fantasy, partly through bonding with her young student Niki. Niki is making a documentary film with her mother about their family's migration from China to their Hakka village in the New Territories. Melanie and Niki Both realize they are living with an original "molecule" that can't be erased even after generations of dilution, the so-called "Memory of Water."