西海
In the better-known Jakjaegeon myth, a part of the Goryeo Dynasty founding myth, Jakjaegeon kills an old Gwishin with a bow at the request of the Dragon King of the West Sea, who appears to him in a dream. The Dragon King of the West Sea gives him his daughter in gratitude, and the Dragon King of the West Sea tells Jakjaegeon that his grandson (King Taejo of Goryeo) will be king. Jakjaegeon has four sons, of which the eldest is Yong Geon, the father of King Taejo of Goryeo.