Due to an injury suffered during the filming of 'Laws of the Jungle 2', cast member Kwanghee made the choice to leave the expedition early.

Although the injury was not serious, due to the strenuous tasks faced by the 'Jungle' cast members - including hunting, collecting supplies, and long-term walking - it was decided that the ZE:A member would depart from the Siberian expedition earlier than scheduled, leaving his fellow cast members to continue the struggle to reach the end of the wilds of northern Russia.

"I wanted to try hard, but this happened," Kwanghee said, revealing his sadness at leaving the other cast members behind. "I want to say sorry to my hyungs."

Source: TV Daily via Nate