Why is Liu Zhenqing respected by future generations?

Are you sure it's Liu Zhenqing? I always thought it should be Yan Zhenqing. He is a great calligrapher, who founded "Yan Ti" regular script, and is also called "four masters of regular script" with Zhao Mengfu, Liu Gongquan and Ou Yangxun. Also known as "strict care" with Liu Gongquan. His calligraphy "A Manuscript for Sacrificing a Nephew" was called "the second running script in the world" by later generations. . The first book is Wang Xizhi's Preface to the Lanting Pavilion, and the third is Su Shi's Huangzhou Cold Food Post. .