Yul is the Sole Survivor

After 39 days, 20 Survivors, four tribes divided by race, a merge and then a mutiny, the Aitu Four surged to victory, paving the way for Yul Kwon, the 31-year-old management consultant from San Mateo, California, to become Sole Survivor. The Aitu alliance bonded together and defeated incredible odds to arrive at the final four, fully intact and ready for business. They competed as hard as they could and stayed true to their small underdog tribe. They ended the game the way they played it: with integrity and loyalty to one another. Yul found the hidden Immunity Idol early in the game and hoped to use it during a game-changing moment. That moment arrived when the Aitu and Raro tribes merged, leaving Aitu at a disadvantage. Yul used the idol to turn the game on its head, and his choice ultimately won him the million dollar prize and title of Sole Survivor on SURVIVOR: COOK ISLANDS.
http://www.cbs.com/primetime/survivor13/show/ep14/