On October 31, 1999, Baek defeated Lakva Sim by split decision to win the WBA super featherweight championship.

[1] He made his first title defense against fellow South Korean Kyu Chul Choi on January 30, 2000, with the fight ending in a split draw after 12 rounds.

Baek lost the WBA super featherweight title to Cuban boxer Joel Casamayor on May 21, 2000, losing by fifth-round technical knockout.

[2] He finished his professional boxing career with a record of 23 wins (20 knockouts), 1 loss, and 1 draw.

This biographical article relating to a South Korean boxing figure is a stub.