Kammala wannan jumla: Asali mai nauyin bantamweight (ƙasa da kilogram 63), Lee ya ragu na ɗan lokaci zuwa nauyin tashi (ƙasa da kilogram 58) bayan da aka ba da izini.
Gasar Zakarun Duniya ta 2011 don yin gasa a wasannin Olympics na 2012, inda akwai nau'ikan nauyi huɗu kawai. Lee ya fara fitowa a matsayin dan wasa na kasa da kasa a gasar cin kofin duniya ta 2011 ta Taekwondo Olympic Qualification Tournament a Baku, Azerbaijan inda ya yi rashin nasarar kasa da kasa ta farko ga Gabriel Mercedes mai lambar azurfa ta Olympics ta 2008 14<unk>12 a wasan kusa da karshe. A watan Mayu na 2012, duk da haka, ya kama lambar zinare ta farko a gasar zakarun Asiya ta Taekwondo ta 2012, inda ya doke zakaran zakarun Asiya Pen-Ek Karaket 8<unk>4 a wasan karshe. A Wasannin Olympics na bazara na 2016, Lee ya lashe lambar tagulla, inda ya doke Jaouad Achab daga Belgium 11<unk>7. A cikin 2016 WTF World Taekwondo Grand-Prix, Lee ya lashe zinare a kan Konstantin Minin.