[3] His racing career started at age 15 with his debut at the 1999 Carman Park Kart Grand Prix.

In 2000 he finished 2nd in the Japan New Tokyo Circuit Freshman Kart Race Time Trial.

He was trained by Myung Mok Lee, who is known as the champion of the Korea Touring Car Championship.

In 2003, Choi was selected as the Samsung Everland Speedway Scholarship driver for the first time and finished 5th at the BAT Championship (Formula 1800).

[5] In 2004, Choi joined the Hyundai Oilbank racing team finishing as a runner-up in the Formula Korea championship.

[9] Choi finished 9th in his second event at St. Petersburg and with his continuous progress, he was ranked 6th in his first qualifying at Lucas Oil raceway oval track.

[12] However, the sponsor company was in the trouble of operating its race track in Korea which left Choi unable to compete in Super Formula series.