Besides a dream of red mansions, what other novels about the back room were written by the ancients?

A Dream of Red Mansions is an epic work. It takes the rise and fall of Jia, Shi, Wang and Xue families as the background, and shows the beauty of women and various social conditions in ancient China from all angles. (not the so-called "secret room novel")

Similar works, such as:

Wu, a writer in the late Qing Dynasty, "The Strange Situation Witnessed in Twenty Years"; Li Boyuan, a writer in the late Qing Dynasty, wrote Officialdom in the Sky.

Other works describing the family class, such as:

Four generations under one roof by Lao She, a modern writer; Modern writer Ba Jin's torrent trilogy, etc.

I hope it helps you.