In August 2008, Son dropped out of Dongbuk High School (formerly FC Seoul U-18 Team) and joined Hamburger SV's youth academy at age 16 through Korean FA Youth Project.
A year later, he returned to South Korea.
After participating in the FIFA U-17 World Cup, he formally joined Hamburger SV's youth academy in November 2009
He was impressive in the 2010–11 pre-season, leading the team with nine goals, and signed his first professional contract on his 18th birthday.
After scoring against Chelsea in August, he was out for two months due to a foot injury.
He returned on 30 October 2010 to score his first league goal, against 1.
FC Köln in the 24th minute.
The goal made Son the youngest Hamburg player to score a goal in the Bundesliga at 18, breaking the record held by Manfred Kaltz.

Son signed a new deal with Hamburg through 2014.
Pundits said he had what it took to become the next Cha Bum-kun, a legendary Bundesliga forward and fellow South Korean.
Son scored three goals in 14 matches in all competition during the 2010–11 season.

During the 2011–12 pre-season, Son was explosive, scoring 18 times in only nine matches.
After missing the opening match due to a fever, Son scored two goals within three matches.
On 27 August, Son picked up an ankle injury in the 4–3 loss to 1.
FC Köln and was initially projected to be out of action for four to six weeks.
His recovery was quicker than expected and he returned to action only three weeks later as a substitute in a 1–0 loss against Borussia Mönchengladbach on 17 September.
Over the course of the 2011–12 season, he made 30 appearances for Hamburg and scored five goals, including crucial goals against Hannover 96 and 1.
FC Nürnberg at the end of the season to help ensure that Hamburg remained in the Bundesliga.

Following Hamburger SV's 2012–13 offseason moves, which saw the transfers of the team's strikers Mladen Petrić and Paolo Guerrero to Fulham and Corinthians respectively, manager Thorsten Fink chose to name Son a starter.
The 2012–13 season was a breakthrough season for Son as he scored two goals in an away fixture against Borussia Dortmund on 9 February 2013, helping his team to a 4–1 victory.
Son was chosen Mann des Tages (Man of the Match) by kicker.
On 14 April, Son netted two goals in a 2–1 win against Mainz 05.
He finished the season with 12 goals, becoming the fifth South Korean footballer to achieve double digits in goals in Europe.
He finished the 2012–13 season with 12 goals in 34 matches in all competitions.
In August 2008, Son dropped out of Dongbuk High School (formerly FC Seoul U-18 Team) and joined Hamburger SV's youth academy at age 16 through Korean FA Youth Project. A year later, he returned to South Korea. After participating in the FIFA U-17 World Cup, he formally joined Hamburger SV's youth academy in November 2009
He was impressive in the 2010–11 pre-season, leading the team with nine goals, and signed his first professional contract on his 18th birthday. After scoring against Chelsea in August, he was out for two months due to a foot injury. He returned on 30 October 2010 to score his first league goal, against 1. FC Köln in the 24th minute. The goal made Son the youngest Hamburg player to score a goal in the Bundesliga at 18, breaking the record held by Manfred Kaltz.
Son signed a new deal with Hamburg through 2014. Pundits said he had what it took to become the next Cha Bum-kun, a legendary Bundesliga forward and fellow South Korean. Son scored three goals in 14 matches in all competition during the 2010–11 season.
During the 2011–12 pre-season, Son was explosive, scoring 18 times in only nine matches. After missing the opening match due to a fever, Son scored two goals within three matches. On 27 August, Son picked up an ankle injury in the 4–3 loss to 1. FC Köln and was initially projected to be out of action for four to six weeks. His recovery was quicker than expected and he returned to action only three weeks later as a substitute in a 1–0 loss against Borussia Mönchengladbach on 17 September. Over the course of the 2011–12 season, he made 30 appearances for Hamburg and scored five goals, including crucial goals against Hannover 96 and 1. FC Nürnberg at the end of the season to help ensure that Hamburg remained in the Bundesliga.
Following Hamburger SV's 2012–13 offseason moves, which saw the transfers of the team's strikers Mladen Petrić and Paolo Guerrero to Fulham and Corinthians respectively, manager Thorsten Fink chose to name Son a starter. The 2012–13 season was a breakthrough season for Son as he scored two goals in an away fixture against Borussia Dortmund on 9 February 2013, helping his team to a 4–1 victory. Son was chosen Mann des Tages (Man of the Match) by kicker. On 14 April, Son netted two goals in a 2–1 win against Mainz 05. He finished the season with 12 goals, becoming the fifth South Korean footballer to achieve double digits in goals in Europe. He finished the 2012–13 season with 12 goals in 34 matches in all competitions.
Son Heung-min