Who knows which are "Song Sijia of Calligraphy" and "Four Bachelor of Sumen"? They should all be.

Calligraphy Song Sijia: The collective name of Su Shi, Huang Tingjian, Mi Fei and Cai Xiang in Song Dynasty, which is considered by later generations as the calligrapher who can best represent the achievements of calligraphy in Song Dynasty.

Four Bachelor of Sumen: the combination of Northern Song writers Huang Tingjian, Qin Guan and Chao He. Among Su Shi's numerous proteges and admirers, he appreciates and values these four people the most. It was Su Shi himself who first mentioned and publicized their names. He said: "Huang Tingjian, Chao and Qin Guan are not known to the world, only history is a prophet." ("Answer to Li Zhao □ Book") Because of Su Shi's reputation, the four people quickly became famous all over the world.