WARNING SPOILER ALERT READ AT YOU'RE OWN RISK
His body is perfectly preserved by a piece of Soul Claiming Jade, a treasure of the Dark Emperor's tomb and the Qi Kingdom. However his soul was in the soul world. But then one day the ruler of the upper realm visited the soul world, and took Jun Gu along with him upon leaving. The ruler of the Upper Realm, then brainwashed him and made him one of his lackey. He is currently one of the four cavaliers.