Yuun is a fellow student of Master Togo's. He is keen to solve the mystery of the plague and has been tracking down some of the plague creatures on his own.
Yuun is available for hire from Shing Jea Monastery onwards until Zen Daijun, where he gets replaced by Zho. Later on, he appears at intervals on the mainland.
"Well met! I am Yuun. The thrill of battle surpasses all other things. You never know that you're truly alive until you can feel the rush of blood through your veins. Did you need something from me?"
"Are we just going to stand around all day? This is so dull."
"I've got this invention I've been thinking about. It's sort of a small cart, well it's not really a cart, just a wooden board with some wheels on it. You balance on it and ride it around. I'm just not sure what to call it yet."
"One thing you have to say about Shing Jea with the Naga, Crimson Skull, Yeti, Tengu, kappa, and Mantids it certainly never gets dull."
During battle, Yuun can be seen yelling "Headshot!", "I can dance all day!", "Try to hit me, try!", and "My heart's beating!". This may be a reference to the popular FPS Doug phenomenon (episode 5).
From what Yuun says, he is the soon-to-be inventor of the skateboard.
Despite his name, Yuun does not use the Ranger elite Quick Shot.