In May 2005 Choi led his team to win the 39th President's Cup National High School Baseball Championship alongside Yang Hyeon-Jong and Han Ki-Joo, winning the RBI title with 9.
In September 2005, Choi was selected for the South Korea national junior baseball team to compete at the World Junior Baseball Championship, where South Korea won the silver medal.
After graduation from high school, Choi was selected by the Doosan Bears with the 50th overall pick of the 2006 KBO Draft.
In 2009, Choi appeared in only nine games for the Bears, collecting no hits in ten at-bats.
After the 2009 season, Choi temporarily left the Bears to serve a two-year mandatory military commitment.