Won Cheon-seok (Korean: 원천석; Hanja: 元天錫, 1330-?), also known by his pen name Ungok, widely considered a political hermit during late Goryeo Dynasty to early Joseon Dynasty and has been known as the writer of Heohoga, a song of reminiscence of the past (i.e. Goryeo Dynasty) in Cheong-gu-young-un, a collective edition of Korean traditional poems. He was born in Gaeseong in 1330. He was a member of the Wonju Won clan, and the son of Won Yun-jeok. He was a bright child and excelled in school. He passed Jinsasi, a civil service exam in Goryeo when he was 27. However he was deterred from entering into government by the chaotic political circumstances in the late Goryeo. He once taught Lee Bang-won, who became King Taejong of Joseon Dynasty later. He was summoned several times and even paid a vis