One day, I found a 1972 postcard in a second-hand grocery store. It was sent from Hong Kong to the United Kingdom. The front is a street photo of Nathan Road in the 1970s. The bustling rainbow lights illuminate the night. The words “brian” and “forks” are printed on the back, which probably describes his period in Hong Kong. In 2021, postcards have been delivered for 49 years. Hong Kong has gradually changed in these 49 years.