He was serving under Kousonsan as the leader of the Yuushuu Troops border police corps, but before Yuushuu surrenders he was entrusted with the art of war scroll by Kousonsan. In his injured state, he was then sent off to Ryuubi (Liu Bei)'s side. More currently he was found by Ryuubi to be in the care of Koumei (Kong Ming). After the Red Cliff battle, he went with the others to Ekishuu to form the country of Shou. In the Brave Battle Warriors anime, he was a general under Enshou. However, after seeing Enshou's greed for the Gyokuji led to his labeling as a traitor, Chou-un decided to serve under Kousonsan instead. He is currently acting as Captain of the Yuushu Border Police Force, with his own White Stallion platoon. When news of Enshou's army approaching Yuushu, Kousonsan sends Chou-un off to find Ryuubi, who is rushing back from Keishuu. Chou-un meets up with Ryuubi, but were too late to save Kousonsan and the Yuushu villagers. The Chou-un Gundam model has a large golden dragon that attaches to his spear to represent his finishing move. When disassembled and attached to Chou-un's body, he resembles the V2 Buster Gundam. When donning the Ryukihou armor, he resembles the V2 Assault Gundam.
