Fragile (2000)

A mysterious raffia bag found by a voyeur neighbor turns out to be a shelter for a baby who seems to have been thrown into the street by his mother. Passed from one apartment to another and not warmly welcomed by either the man passionate about martial arts, the bride awaiting her tap-dancing groomsmen, or the young gum-chewing girl who is having an affair with the kung-fu neighbor, the protagonist turns out to be, in fact, the product of a social science fiction experiment.