The Imperial Horse Supervisor of 4399 Dream Making Journey to the West 3 High School was in charge of managing horses. It was located in the North Heavenly King Palace. At the beginning of the story, Tang Sanzang and his disciples needed to go to Tang of the East to obtain scriptures. The officials in the Imperial Horse Bureau were responsible for arranging the horses they needed to ensure that they could go smoothly. Therefore, the North Heavenly King Palace was the place where the Imperial Horse Supervisor was located. During their journey to the Tang of the East, Tang Sanzang and his disciples often went there to check on the horses.