Cheng Xi (Xiao Yin) was a famous disciple of the Immortal Sect at the time. When he was 10 years old, his family was exterminated by the five demon kings. Yu Qingjiu saved him. But lost his memory.
Ten years later, by chance, he met Cheng Xi again and became friends, and they fought with him to the end of the world. In an accident, I met the Nightmare Demon, one of the five demon kings, in Huaqing Mountain. Yu Qingjiu vaguely remembered some things from that year. Then he accompanied Cheng Xi to find the truth of that year.
Purpose: The truth comes at a price.
