During the war between gods and demons, the divine race fought desperately but still could not withstand the demon race's army of monstrous beasts. Suddenly, the Bull Demon appeared to help the divine race fight against the demons and summoned the ancient gods from their resting place in the Ancient Gods' Tomb. With the ancient gods' help, the divine race wiped out the demon army, while all the heavenly gods joined forces to destroy the Demon God. The Bull Demon also had to fulfill his promise to the ancient god by traveling back to the past to observe his own past and embark on a journey to discover the true meaning of life.