The author is pretty popular on Novel Updates. With lots of prequel novels and shared universe novels.

You can find them here:

A Mistaken Marriage Match: A Generation of Military Counselor (Prequel)
A Mistaken Marriage Match: Record of Washed Grievances (Prequel)
A Mistaken Marriage Match: Mysteries in the Imperial Harem (Prequel)
A Mistaken Marriage Match: The Pirate’s Daughter (Shared Universe)

Hopefully, there are enough readers for this novel.

Enjoy