According to Mo Yun, the Devil Cult had joined forces with the vampires to engage in a decisive battle with the people in Martial Arts, but in case of emergency, the Devil Incarnate instructed Mo Yun and some other disciples to stay behind at the Magic Cult's Headquarters. Among those who stayed was Gu Fan.
After the Devil Cult and the vampires were annihilated in that battle, Mo Yun knew that the people in Martial Arts would certainly come back to seek vengeance on the Devil Cult, so she tried to transfer the wealth of the Cult. Unfortunately, she was a step too late.
A group of nobodies who wouldn't dare to show their face on a normal day, seeing the Devil Cult's decline, decided to loot the fire and attempt to seize the Cult's treasures.
Mo Yun led the remaining few from the Devil Cult to resist, managing to preserve some of the Cult's assets, but not without sacrifice, leaving behind only Mo Yun and Gu Fan.