He was born on October 20, 1974, in Busan, South Korea.
Oh Chi-hoon is the grandson of Oh Woo-young, the honorary chairman and founder of Daehan Steel, and the eldest son of Oh Wan-soo, the former chairman. His uncle is Oh Keo-don, the former mayor of Busan.
After graduating from Dongin High School in Busan, he earned a degree in business administration from Yonsei University. He later completed the "General Management Program" at Harvard Business School in the United States.
Daehan Steel, originally founded as a hardware store in Busan's International Market in 1954, has grown into a leading local company in the Busan area, achieving mid-sized enterprise status with sales exceeding KRW 1 trillion (US$ 721.2 million) as of 2023.
It is the third-largest rebar manufacturer in South Korea, following Hyundai Steel and Dongkuk Steel.
As a third-generation leader, Oh Chi-hoon is credited with driving Daehan Steel's growth. In 2006, he led the company to become the first in South Korea to manufacture and sell coil rebar (BIC, Bar-in-Coil), while also expanding its rebar processing business domestically. These achievements are widely regarded as significant milestones under his leadership.