One is from the middle school attached to Peking University. The website "Bi Li Bi Li" advocates many people, such as Yi. As of July 29th, 2022, according to Zhang Yi's relevant information, he graduated from the High School Attached to Peking University and went directly to Peking University for further study after graduation. He mainly talks about the mathematics knowledge of senior high school and junior high school on the website of "Bi Li Bi Li".