My Sister is Ma Xiaoling from My Date with a Vampire

Because his mother was seriously ill, Ma Tian made a deal with the Heavenly Dao of the "My Date with a Vampire" world, transmigrating into the "My Date with a Vampire" world to become a variable, eliminating the fate of the "My Date with a Vampire" world and the Pangu clan and their descendant zombies, allowing the Heavenly Dao to regain control of this world in exchange for his mother's recovery. From then on, Ma Tian was sent to the "My Date with a Vampire" world and became Ma Xiaoling's older brother, thus becoming deeply involved in the plot of the "My Date with a Vampire" world and constantly defying fate towards his goal...