He was then drafted into the Hong Kong's senior fencing team and began to study at the Institute of Vocational Education, Chai Wan.

[5] Despite losing in the first round to Romania's Radu Dărăban,[6] he received a “Hong Kong Potential Sports Star Award” for his achievement.

[7] In 2018, Choi won two silver medals in the men's foil individual and team event at the Asian Games in Jakarta, Indonesia, which is the best-ever result of Hong Kong fencers.

His father is the leader of the Hong Kong fencing team; his elder sister serves as the head of English at a Direct Subsidy Scheme secondary school on Lantau Island;[10][11][12] and his younger twin sister Natasha Choi was also a fencing player.

[13] Choi studied at Lam Tai Fai College and took the Hong Kong Certificate of Education Examination (HKCEE) in 2010.