Career
At 39, Sin finally passed the higher exam of the gwageo and was sent to Jeju as an official He wrote a description of the island. His famed words from later life include the Gwan sang yung ma (Hangeul:관산융마 Hanja:關山戎馬) and Gwanseo akbu (Hangeul:관서악부 Hanja:關西樂府).
