I accidentally learned about the ugly old custom of "principal wife", so I wrote this story.
In this story, the heroine Wu does not even have a name. She was betrayed by her husband Chen Shuner and moved to the Hu family as a concubine. The Hu family did not care about her life and death for the sake of their children. The only one who sympathized with her was her concubine, and the only one who worshiped her was her sister.
Purpose: Anti-feudalism