Hung knows his way around the city's streets even better than the local minders, for he was the "instigator" of the volunteer teams 'work in Vietnam, and has taken part in every trip.
走在胡志明市街頭，洪凱風簡直比「地陪」還要熟門熟路，因為洪凱風是越南義診團的「推手」，每次義診一定隨行。