Detective Dee and the Phantom of Waning Moon.

During the Tang Dynasty, Princess Taiping dreams of riding a "Silver Snow White Horse" in a "dreamland under the moon". Xuanji, a female diviner, interprets the dream, revealing that the white horse represents a "celestial horse", making the princess's dream a reality. Meanwhile, the renowned detective Di Renjie solves a "massacre case", which turns out to be a tragic event caused by the "celestial horse".