The Celestial Master is, in fact, a Master to the Heavens.
Since the first Ancestor Celestial Master, Zhang Daoling, the title of Celestial Master has all but become exclusive to Dragon Tiger Mountain.
However, the current Celestial Master, though named so, is not actually referred to as the Celestial Master but instead, he is called the 'Great Real Man'. As such, the Celestial Master's Mansion on Dragon Tiger Mountain has also become the Mansion of the Great Real Man.
This came about after the founding emperor of the Great Ming ascended to the throne. Upon hearing of the title Celestial Master, he laughed, saying, "Can there be a Master of Heaven?" Thereafter, the title of Celestial Master that had been passed down for thousands of years was changed to the Great Real Man.
From the beginning of the emperor's reign until the death of the second emperor, the common people referred to it as the Mansion of the Great Real Man.