Earlier, South Korea defeated Japan 3-1 (25-18, 21-25, 25-15, 27-25) to take the bronze medal. Son is now expected to return to action for Tottenham once the worldwide break is over in two weeks' time.
Playing in front of 10,832 fans at the Pakansari Stadium in Bogor, West Java, the two Asian soccer powerhouses failed to score a single goal during 90 minutes, going into extra time to determine the victor. "We can win a gold medal against South Korea if we take them head-on with all our strength".
Japan had a couple of chances to level the score with two minutes of additional time given, but South Korean held on for the victory and the precious gold medal.
But Japan closed the gap with one of their own.
Son was part of the South Korea team that won against Japan in the Asian Games football final on Saturday.
"I am so thankful to Tottenham because they let me go, normally it's not easy to do", Son said, dedicating his gold medal to his country.
Obama, Bush pay tribute to McCain
McCain was gone, said Bush, who called his 2000 rival for the GOP presidential nomination a friend. Bush said McCain "detested the abuse of power and could not abide bigots and swaggering despots".
"Normally that's not an easy decision".
Asian Games final 2018: South Korea 2-1 JapanWhen will SonHeung-Min return to Tottenham? "I would have felt very sorry if I didn't win the gold medal", he added. He dedicated the gold medal to the fans in the stands in Indonesia and back home in South Korea and said, "I have the gold medal around my neck but it really belongs to the people".
For many of us, it's hard to comprehend what that must be like.
At the time his German Bundesliga club, Bayer Leverkusen, refused to release him - the tournament isn't officially recognized by Federation Internationale de Football Association, and clubs aren't obliged to release their stars.
The 26-year-old will now not have to worry about carrying out the two-year mandatory military service for South Korea. "They showed real spirit and can be proud of themselves".
After this year's Pyeongchang Winter Olympics, Tokyo is holding the 2020 Summer Games and Beijing will host the winter edition in 2022 - becoming the first city to organise both the summer and winter Games.