It's a Showdown, My Husband Is the Regent.

A female forensic doctor in the 21st century traveled through time and became an ancient peasant girl. After being forced to marry a "poor scholar", she used modern forensic knowledge to solve cases and became famous while "taming her husband" to live her life. It wasn't until she came to Beijing that she discovered that the man whom she made to kneel on the washboard was actually the current regent.