Chi was born in Seoul and made his debut as a professional boxer on November 20, 1991.
He challenged WBC Featherweight Title holder Erik Morales on July 28, 2001, but lost a unanimous decision.
After defending the title twice, he lost the belt to Takashi Koshimoto in 2006 via split decision.
[1] Chi recaptured the WBC featherweight title with a unanimous decision over defending titlist Rodolfo López at the Chungmu Art Hall in Seoul, Korea, in December 2006.
[3] On February 24, 2008, Chi made his debut as a K-1 fighter on the K-1 Asia MAX 2008 in Seoul.