Redology (Chinese: 紅學) is the study of the novel Dream of the Red Chamber, one of the Four Classics of China. There are many researchers in this field, most can be divided into four general groups. The first group is the commentators, such as Zhou Chun, Xu Fengyi, Chen Yupi, and others. The second group is the index group, which mainly includes Wang Mengruan and Cai Yuanpei. The third group is the textual critics, including Hu Shi and Yu Pingbo. The final group is the literary thought group. There are quite a few researchers in this group, most notably Zhou Ruchang.

Source: Wikipedia