Who is the author of the novel Qian Qiu? Who added Yu Yue to the novel?

In Qian Qiu's novels, Yu Yue, a stranger, describes Shen Jiaojiao, a master of self-service in Du Xuan, and Yan Wushi, the founder of Happy Gate. According to relevant public records, the story of the relationship between Shen Jiao, a master of Zifu, and Yan, a master of Huanyue School. One is good and the other is evil. Where the Tao is, the sword is there. Feather Yue is a brand-new revision of Meng's classic masterpiece.