The sixteen-year-old took the silver in the boys' techno 293 category, with Mayan Rafic of Israel winning the gold medal. Britain's Kieran Martin took the bronze.
Michael, a student at Stewards Pooi Kei College, was ranked second going into the final race on Wednesday. The event comprised a total of 11 races spread over nine days.
Michael had a rough start to the final race, as he accidentally crashed into another boat. But he held on to second place overall after finishing fifth.
After the race, Michael jumped into the sea to celebrate his victory.
'I am so tired,' he said. 'It feels great to win a medal. I have to thank my coach, my parents and all the guests who supported me here.'
It wasn't easy for Michael as there was very little wind on the day.
'I'm taller and heavier than my rivals. I have an advantage in strong wind conditions, but there wasn't much wind so I used more energy,' he said.
To add to Michael's joy, his mother made a surprise visit to Singapore to cheer his son. It was a dramatic moment when Michael saw his mum after the race.
'Hey, that's my mum waiting for me!' he exclaimed.
Michael's mother, Jackie Wong, said: 'I nearly collapsed when I saw the Hong Kong flag rising to the top of the pole. I really want to thank the coach for choosing my son to represent Hong Kong at the YOG.'