This summer, the whole team traveled to kick, media The Athletic UK Tottenham Hotspur follow reporter Charlie Eccleshare also made a special trip to South Korea to interview some of the friends and family.
Eccleshare ran an interview with Sun and the school his father runs to find out some of the things that Sun has done to educate him in soccer since he became famous.
This soccer school is in Chuncheon, South Korea, several hours drive from Seoul, in a more pristine environment, in other words a bit more mountainous.
But it's also the capital of South Korea's Gangwon Province, just not as developed as Seoul. with the 2018 Winter Olympics also in Gangwon Province, there's still a sporting gene.
Students at the Sundowns Soccer School will be here from the age of seven, but these young children will also receive a normal national quality education, as well as some foreign language study in preparation for traveling to Europe.
The TA interviewer arrived in Chuncheon to meet Son Woong-jung and then watched one of their training sessions.
Sun Xiongzheng said including Sun and now small children to this training the biggest difficulty is the climate is not suitable, cold winter and summer heat, air humidity.
That's one of the reasons why Sun Xiongzheng will take Son, where he can have a better training environment.
Now that Sundowner can make a lot of money, I will provide an environment like Germany for the children here.
The TA team observed that youth trainees at the academy did not train as much as they thought they would, with one 12-year-old training for only 15 minutes.
Sun Xiongzheng's principle is that you can't play or even shoot until you're 15 years old, and that's what he asked Sun to do.
"You can't put kids who can't walk in track and field for the same reason. Playing a game starts with being able to control the situation, and what's the point of going to a game if you can't even control the ball?"
"A lot of parents, schools and even clubs nowadays are sending very young children to tournaments, not to develop them as players and basic skills, but to win local tournaments and for their own benefit."
"I wouldn't let kids who aren't 15 years old shoot, it damages their ligaments and joints, they're not developed yet, and that's the case with Sun."
In addition to Son, Son's oldest son also played for Halstenbeck in Germany's lower division, but retired early.
Sun Xiongzheng was also very honest and blunt in his assessment of him "He just doesn't have the talent."
The young man who came out of the Sundowns soccer school spoke highly of the veteran instructor, praising him as a strict teacher.
In fact, I am in reality also do with the football-related industry, around a lot of parents will be sent to the small children to soccer summer classes, interest classes, a month to be about 20,000 yuan.
These soccer training institutions also often organize matches in which children aged six or above will play on the field, which is indeed the same as what Sun Zhengxiong said.
The dimensions are different, though, and the soccer training organizations we've come across really just have a heavier component of entertaining kids.
Domestic also have Xu Genbao formed Genbao soccer in doing professional youth training training.
