The winger could well make his return for Spurs after the global break when they host Liverpool in two week's time or in their Champions League opener against Inter Milan.
The country will grant the Spurs winger and his worldwide team-mates an exemption after they beat Japan 2-1 after extra time at the final in Indonesia, to scenes of jubilation in Cibinong.
"This is the best day in my life", Son told AFP, clutching his gold medal.
"I might have said a few harsh words to my teammates, but they did not take it the wrong way as they knew what needed to be done".
Despite knocking champions Germany out of this year's World Cup - before themselves crashing out in the group stages - South Korea's senior football team were not adjudged to have done enough to escape the service.
Since 1990, South Korea has won the gold at every single Asian Games apart from the 2010 edition in Guangzhou.
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You can't not be delighted for the former Hamburg man - but we reckon no-one will be more pleased than Spurs given there was a chance he would miss a lot of football had he not triumphed today.
South Korean men must complete 21 months of service before turning 28, but there are exemptions for athletes, like those who win gold at the Asian Games.
"I really thank the coaching staff and players".
Son was selected to play at the 2014 Asian Games but his former club Bayer Leverkusen refused to release him - and the Koreans scooped gold.
"At least 80 percent of the credit for that goal goes to the pass (from Watanabe), the only work I did was at the very end", Ueda said.
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.