Son is the national team captain and adored by the millions of football fans across the country… many of whom have now adopted Spurs as their team.
The forward has returned to his home nation before, in the colours of Hamburg and Bayer Leverkusen, but this tour's impact has blown away anything experienced before.
"Incredible," marvelled Son.
"The fans, the love. We are feeling the love. With Spurs, I think it is more special because the fans are more interested in our football and the big players.
"It's gone too fast for me because it's really enjoyable. I'm just grateful that everyone loves us, loves the Spurs and loves the team."
It is not only that Son is a South Korean player in the Premier League, it is the fact he has made history that has helped his global status.
He won a share of the Premier League Golden Boot last season and is just seven goals away from joining the 100 club.
Former Tottenham defender Lee Young-pyo revealed just how much of a superstar Son is in Asia.
He said: "He made history and we are very proud of him because they are comparing him to Mo Salah. He improved himself into one of the top players in the world, it's amazing.
"I know David Beckham was an icon in English football because I lived there at the time.
"Sonny is even more idolised in Korea. All Korean media are talking about Tottenham. Only good things. They are bigger than Manchester United over here."
The figures behind Tottenham's tour of South Korea have been astronomical and helped cemented their fan base in the country.
Spurs took 107 members of staff on tour with them, but any short term financial cost will be replaced by long term rewards.
According to Football.London, 12 million of the country's 51 million population identify themselves as Spurs fans.
Their match against Team K-League last Wednesday was streamed online by two million people, making it the single biggest streamed sporting event in Korean history.
The tickets for their two matches sold out in minutes - the 64,000 for the Seoul World Cup Stadium in 25 minutes, while the 44,000 in Suwon were gone in 20.
Fans were also reportedly queuing for more than an hour to have their photos taken with cardboard cut outs of the Tottenham players.
And of course, Son is humble to go along with all the adulation as he welcomed everyone on Tottenham's tour with a gift.
He also took his teammates out to a traditional Korean barbecue restaurant, picking up the bill afterwards.
And it wasn't just Son to receive the adulation either with other players also doted upon - and even former Spurs star Erik Lamela, who played with the Korean for six seasons, was mobbed while in the country with Sevilla.