In the middle of his soliloquy, Cai tells us that he's a liar. He says that he promised to stay by Cai's side no matter what, and that's exactly what Cai has done. Cai then explains that the black water in question is actually a single cell that has been cultivated by the Bai family. During the reign of Emperor Bai, the family stole the heart of a vampire and used it to make black water. The blood from the vampire's heart is the water that Cai and his family now make. Cai says that great achievement is only possible because great sacrifice is required. He then says that Cai is stronger than ever and that he won't be able to go easy on Cai anymore.