The story begins five hundred years after Baili Tusu dissipated. A rumor that "memories can be traded" quietly spreads through the hidden corners of the Three Realms. Soon, a mysterious organization called the Forgotten River Ruins emerges. It can help people forget their pain, or regain lost skills and emotions. However, anyone who makes a trade gradually loses the emotional color of their life, becoming numb and indifferent.
While investigating the case, Feng Wuya, the new guardian of the Youdu Nüwa Temple and inheritor of Feng Qingxue and Baili Tusu's spirits, discovers that its source points to the other half of Prince Changqin's soul, reconstituted by the world's "sorrowful wishes." He seeks no revenge. Instead, he wants to create a world "without pain." Before emotions are completely erased, Feng Wuya must join forces with a new generation of companions, uncover the unknown ancient art of forbidden memory, and confront the ultimate question: "To protect memories is to protect our humanity."
