Taeyong was the devil himself. He was doubtful of his power and wanted to be eternally powerful. So, a sorceress gave him a solution in exchange for her life. She told him that there was an ethereal being, an angel up in the heavens. She was a Seraphim, the most precious, gracious and most pure angel of them all. She was the most devout to the Lord, and she would heal those who were righteous and correct the path of the astray. Just one drop of her essence is all Taeyong needs to remain eternal.