How did the Acacia School of Zhu Xian 2 get the title of real person?

I got it when I was on an acacia mission. Every Saturday is Albizia Day, and I am doing the Gengetsu Cave mission in Qingyun. After I finished writing, I got the title of pure desire real person of Acacia School. First of all, I took the task of Jin Pinger in Heyang, then I took the task of exorcism of Liubo, and then I took the task of Gengetsu Cave in Tortoise. (This task can only be completed after the grade is 125).