Could this Spurs new boy be off to serve in the army? Well... maybe!
In fact, we don't blame Spurs fans for being very excited by the South Korea international, who has been a revelation in the Bundesliga for Hamburg and then Leverkusen.
However, we're not sure if Spurs fans will know this about their new £22million pound signing...
Top Corner (@HITCtopcorner) August 28, 2015
Yes, we've done some more detective work and found out that Son may well be called up to South Korean military if he doesn't bag himself a medal with his country at the Olympics next year.
And while Son might be unlucky, the likes of Arsenal 'legend' Park Chu Young and Swansea's Ki both missed out on the call up thanks to winning a bronze medal at the Olympics while ex-Manchester United cult hero, Park Ji Sung missed out thanks to his performance at the 2002 World Cup.
Another who has avoided doing service is Crystal Palace winger Lee Chun-yong, due to him dropping out of high school.
So, do you reckon Son will be called up to the South Korean army? Well, we reckon he'll be alright, but bet Daniel Levy will be a little miffed if it actually happens...