|Novel||Moribito: Guardian of the Spirit|
Yun is a Hunter and a descendant of one of the Eight Warriors who aided the hero who founded New Yogo after he defeated a water demon. His name is an alias meaning "four".
In the anime, Yun is among the four Hunters initially sent to retrieve Prince Chagum when he is taken by Balsa. He and Zen are quickly defeated by Balsa, with Yun taking a blow to his nose that apparently results in a scar across the middle of his face. The Hunters survive the encounter due to Balsa's efforts to avoid killing her opponents.
Yun's most notable skill is a superb photographic memory, as he was able to skim through one of Toya's record books and completely memorized the contents. The skill is particularly indicative of the Hunters' primary purpose as information gatherers rather than combatants or assassins. In combat, he wields two swords simultaneously instead of one.
In the novels, Yun is one of the Hunters who helps save Tanda from a flower demon  during the events of Guardian of the Dream. In Traveler of the Blue Road, Yun is one of two Hunters sent to escort Prince Chagum on a diplomatic mission to Sangal. He is ordered to assassinate Chagum by the Mikado and attempts to smother the prince while Chagum is sleeping, but is stopped by Jin.
- ↑ Guardian of the Dream, Nahoko Uehashi, 2000.