Ancient Workplace, Love Handbook

Xu Xing Lan, a new employee in the workplace, accidentally traveled to ancient times and became bound to her target, Yu Wen Yan, the second young master of Anjin City! By mistake, they started a cat-and-mouse game of love and hate. And she used modern thinking to start a wonderful journey from the "first female killer" to the "first female official" in Anjin City.

(Source: Chinese = Douban || Translation = MyDramaList)