Gyou Un is a tall man with goatee. He wears ornamented helmet and armor. His snake crested helm goes back to his days as one of the Rin Family's Ten Heroes under Rin Shou Jou.
After Rin Shou Jou passed away, he alongside Chou Ga Ryuu kept central Zhao safe and were the only two of his deputies to survive, as they were the only ones able to reach their master at his final hours and were forced to swear on Rin Shou Jou's deathbed to not follow him into death. In contrast, their other eight colleagues followed Rin Shou Jou into death in a series of suicidal battles dedicated to their master. Because of their work under Rin Shou Jou and safe keeping Zhao's central region, their name did not spread far beyond Zhao's borders.
He along with Chou Ga Ryuu were called by Ri Boku to defend against the invading Qin in Zhao's central lands. They met at Kantan, and moved out in order to face the Ou Sen Army. Gyou Un is positioned in the center of the Zhao forces, together with Fu Tei & Kin Mou, under the command of Ri Boku.
He was the best warrior in Rin Shou Jou Army and the symbol of its martial might.