Wang Ko (Korean: 왕고; Hanja: 王暠; Mongolian name: Öljeyitü (完澤禿); d. 1345), known by his Korean Royal title as Prince Yeonan (연안군; 延安君) and served in Yuan as King Shen of Yang (심양왕; 瀋王), was a Goryeo Royal Family member as the son of Duke Gangyang and grandson of King Chungnyeol who became a nobleman in Yuan Dynasty and a potential competitor to King Chungseon (his half uncle) and King Chungsuk which favored him.
Öljeyitü married with a daughter of Sungshan (松山 songshan), King of Liang (粱王) of the imperial family.
When Sidibala (Gegeen Khan) ascended to the throne in 1320, Öljeyitü began a campaign to become the King of Goryeo.
By his scheme, the Khan banished Chungseon to Tibet in 1320 and interned King Chungsuk in 1321.
When King Gongmin died in 1374, the Yuan Dynasty in Mongolia tried to appoint him again and a faction in Goryeo welcomed the plan, but it was eventually failed.