As the dispute between the Demon Party and the Secret Party within the Vampire Clan became increasingly fierce, Ye Yin's son Ye Mu temporarily replaced his father as the Prince of the Vampire Clan and participated in the meeting at the headquarters of the Vampire Clan's Secret Party in Prague. Who knows that an unexpected conspiracy is waiting for him there. The leader of the secret party was accidentally killed. Ye Mu who was present and the human girl Bei Gongrui who was accidentally involved also became suspects and were hunted down by the secret party. Ye Mu and Bei Gongrui had to travel back to various times in the form of animals. By solving the root causes of regret for the vampire princes, they collected the tokens one by one, unlocked the sealed mirror, and found out the real murderer.