Yam Wai-sang is the second-generation operator of a printing shop in Hong Kong. He hopes to let more people know that letterpress printing, one of China's Four Great Inventions, once had a glorious era in Hong Kong.<br /><br />WATCH MORE: https://thestartv.com/c/news<br />SUBSCRIBE: https://cutt.ly/TheStar<br />LIKE: https://fb.com/TheStarOnline
