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Is There Any Concubine Article About Keeping One's Own Rules? the One Who Gets Along Harmoniously with His Mistress?

I'm used to reading about concubines and concubines, so I want to change my taste and read about concubines. But I don't want to read about concubines who are in a higher position. I want to see about concubines who live in harmony with their mistresses, and even become the mistress's confidants. It's the kind of concubine who lives her own life and has some small happiness.