500 years ago, three spirits escaped from Heaven, but Wu Kong got separated from Zi Xia and Bu Kong. Now they’ve all taken human form as the latter two head an army to fight the Bull Demon. It is during one of those battles that Zi Xia recognizes Wu Kong, with whom she was in love, as one of the enemy’s surgeons. But when she finally gets a chance to meet him she realizes he has forgotten his own identity.