Jiufang Yu was one of the most powerful members of the younger generation in the Illusory Demon Realm. He is apart of the Jiufang Family, one of the Twelve Guardian Families.
During the Hundred Year Reigning Ceremony he fought against Yun Che and due to his arrogance he let Yun Che punch him without moving but planned to use his Profound Energy to create a backlash to cripple Yun Che. This caused Yun Che to cripple him by displacing his internal organs and deforming more than ten ribs. While even though they did not break, it was much scarier than breaking, it was as though they had been forcefully reshaped along with countless destroyed meridians. [1]