What has a master lost because of loneliness and amnesia? I still don't know after reading all the books.

Many conversations with Xi are emotional blending with Xi. Whether it is the next stage of artistic conception or the key to the strongest artistic conception, it is all about Xi Er's worry and her desire to protect Xi Er according to rhyme. It can be seen from the review of the countdown chapter of Jianghu Department that the purple shirt restores memory according to rhyme. I don't understand why Xi wants Yi Yun to lose his memory. The only thing I can think of is a chapter in which Yi Yun feels a little strange when the purple shirt kisses Yi Yun's mouth. Later, he replied that he would get drunk, which seemed to affect self-study. At the beginning of the Mythology Department, Yi Yun asked Xi 'er to teach him the amnesia solution for the sake of mutual affection, and told him not to influence his own practice. I think it's a bit far-fetched, so I think one more thing is that Xi Er won't let Yi Yun accompany her to carry it. As can be seen from the words of Yi Yun of the Mythology Department, Yi Yun has been protecting Xi 'er, and Xi 'er is afraid that Yi Yun can't grasp his position at the last moment, and Yi Yun is very strong.