Kang started training Brazilian jiu-jitsu in 2006, proceeding rapidly to mixed martial arts.

He fought mainly for international promotions, such as Spirit Martial Challenge, Art of War and DEEP.

[5][6] In the semifinal on June 16, 2012, at Road FC 8, Kang faced Jae Hoon Moon.

Once again Kang won via submission due to a rear-naked choke in round two and was crowned the first-ever Road FC bantamweight champion.

[7] In July 2012, it was announced that Kang had signed a contract to compete in the Bantamweight division of the Ultimate Fighting Championship.

[8] Kang was expected to face Alex Caceres on November 10, 2012, at UFC on Fuel TV: Franklin vs.

[8] However, Kang was removed from the event due to injury and was replaced by promotional newcomer Motonobu Tezuka.

[13] Kang faced Shunichi Shimizu on January 4, 2014, at UFC Fight Night: Saffiedine vs.

[19] Kang put a hold on his career to serve his two-year commitment for mandatory South Korean military service.

[20] In December 2017 he returned from hiatus to face Guido Cannetti on January 14, 2018, at UFC Fight Night: Stephens vs.

[39] Kang was initially scheduled to face John Castañeda on November 18, 2023, at UFC Fight Night 232.