The 22-year-old has been plying his trade in Germany since 2008 when he joined Hamburg's academy. Son graduated to play for Hamburg's senior team between 2010 and 2013, before joining Bayer Leverkusen in 2013 for a reported 10 million euros.
In a fan Q&A on the UEFA Champions League Facebook page Son revealed that his Bundesliga debut ranks as the highlight of his career.
"When I was 18 – my first Bundesliga match against 1. FC Köln. And I scored!" he said of his top moment in football.
Son revealed that his best friends at Leverkusen are Hakan Calhanoglu, Bernd Leno and Karim Bellarabi, adding that: "Kyriakos Papadopoulos and Bellarabi are really funny. They are full of jokes in the dressing room."
Son has had to face up against some of the world's best defenders, but there are two in particular that he rates as Europe's best: "There are so many! If I had to choose one it would be Jerome Boateng or Philipp Lahm. Bayern have a lot of talented players."
The Korea Republic ace was at the forefront of his country's bid for the recent Asian Cup, scoring in the final, but he could not stop Korea from falling the final hurdle. Despite this, Son has fond memories of the tournament.
"It was a success even though we didn't win the tournament," he explained. "It was a great atmosphere and a lot of fun!"
Leverkusen's Champions League aspirations received a major boost when they grabbed a 1-0 victory over Atletico Madrid in the first leg of their last-16 tie, and Son is confident that they can complete the job and progress to the quarter-finals.
"I'm very confident," he said. "We have a good advantage after the first leg. But, we'll have to play our game and have another good day in Madrid to advance."