My Date with a Vampire III (2004)

Fong Tin-yau and Ma Siu-ling are living happily in Heaven after their success in 2001. However, in 2004, Yaochi Shengmu breaks free and introduces a deadly virus to wipe out the entire Pangu clan. Fong, who is infected by the virus and is on the verge of dying, manages to send Ma back to the human world. Ma has to find ways to stop an imminent clash between Fuxi and Yaochi Shengmu because that could lead to the end of the world.

Just as relations between Fuxi and Yaochi Shengmu start to improve, and the situation becomes more stable, Fong Tin-yau, Ma Siu-ling, and their allies are confronted by Destiny, the entity that controls and dictates the fates of all beings in the universe. They need to overcome Destiny in order to change the fate of the world.