ALSO READUS THAAD deployment in South Korea great threat to Russia: Russian officials South Korea to boycott 2017 bobsleigh World Championships in Russia Russia takes swipe at US missile defence in South Korea China, Russia say united against South Korea missile defense THAAD in South Korea to be operational soon: U.S.
Qatar now stands five points behind third-place Uzbekistan and will need to win both their final games in Group A -- and hope Uzbekistan lose both -- to stand a chance of qualifying, reports Xinhua news agency.
Meanwhile, South Korea remain a point ahead of Uzbekistan in the race for the automatic second qualifying spot in the group.
The team that finishes third will enter a playoff over two legs for a place in the 2018 World Cup.
Qatar largely owed its victory to the shining performance of Hassan Al-Haydos and young forward Akram Afif.
Al Haydos put Qatar on the board in the 25th minute on a free kick, set up after a South Korean turnover.
Afif scored Qatar's second goal in the 51st minute, but the home side's fragile defence could not stand firm.
Goals from South Korea's Ki Sung-Yueng and Hwang Hee-Chan in the 62nd and 69th minute seemed to have secured South Korea a valuable point in their attempt to get to Russia, but fine work from Brazilian-born Rodrigo Tabata set up Al-Haydos for a 74th-minute winner.