Few would guess that Hong Kong’s first plant-based canned coffee brand, Busy Brew, is run by a 23-year-old. One might be tempted to see it as a Gen Z entrepreneur fairy tale: a student spots a gap in the market, builds a cult following for her canned oat milk lattes, lands incubation funding and watches the product fly off shelves in some of the city’s largest retail chains. But founder Nikita Kuwadekar, born and raised in Hong Kong, will be the first to tell you that the journey has not been...