Baek joined The King of Iron Fist Tournament 5 along with his apprentice, Hwoarang. After he learned that his student had been critically injured by his rival--Jin Kazama--Baek withdrew from the Tournament and hurried to the hospital. Emergency measures were taken and Hwoarang's life was saved, but he was unconscious. Baek was wrought with guilt that he had failed to prepare Hwoarang for his encounter with Jin. Hwoarang woke up three days later, and when he learned about the events that had passed, he forced himself out of bed and proceeded to beg his mentor to train him and make him stronger. He implored his master with such humility that Baek, sensing the intensity of Hwoarang's will, dedicated himself fully to developing his pupil’s abilities.

After they returned to Korea, Baek engaged Hwoarang in the most extreme training regimen he had ever designed. The Mishima Zaibatsu announced The King of Iron Fist Tournament 6 as Baek trained both himself and Hwoarang for the ensuing battle.