Lee attended Samil Commercial School in Suwon, where he played basketball under the coaching of his father.

[1] In middle school, Lee was only 170 centimeters (5 ft 7 in) and played as a guard, as he practiced dribbling and mid-range shooting.

[4] While at the academy, he played for the BA Centre of Excellence in the South East Australian Basketball League (SEABL) in 2018 and then the NBL1 in 2019.

[5] In conjunction with the NBA Global Academy and the Centre of Excellence, he attended Lake Ginninderra Secondary College,[6] where he learned to speak English.

[19] On July 11, 2023, Lee signed a three-year deal with the Illawarra Hawks of the Australian National Basketball League (NBL).

[22] Lee played for South Korea's junior national team at the 2015 FIBA Asia Under-16 Championship.

[26] Lee's mother, Sung Jung-a, won a silver medal while representing South Korea in basketball at the 1984 Summer Olympics.

His father, Lee Yoon-hwan, played semi-professionally before becoming a high school athletic director and coach.