Lee made his professional debut against Chung Woo Chee in June 2009, winning the fight by decision.
On the back of these wins, Lee was given a chance to fight Samuel Hadzima at Simply The Best 6 for the WKN Intercontinental Lightweight title.
[10] Lee then fought Genji Umeno, for the third time in his career, in the semifinal bout of the 2019 RISE World Series.
[11] After losing to Kento Haraguchi in September 2019, Lee fought Suakim PK Saenchaimuaythaigym in December 2019, for the Battle of Muay Thai Super Lightweight title.
Lee was knocked down in the first round, but was able to build back into the fight by utilizing body shots and low kicks.
[18] Lee faced Yuma Yamaguchi in a lightweight open finger glove bout at RISE World Series 2023 - 1st Round on July 2, 2023.
[20] Lee faced Hideki at RISE World Series 2023 - 2nd Round on August 26, 2023, in the latter's retirement bout.