Watch FMovies. 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. Niki is making a documentary film about their family’s migration from China to their Hakka village. Melanie and Niki Both realise they are living with an original “molecule” that can’t be erased even after generations of dilution, the so-called “Memory of Water.”