Dr. Cutie

Shen Zhao Er is the daughter of the palace-appointed doctor and grew up with Ji Heng, the son of an official of the king. In an incident of poisoning concerning a royal consort, Zhao Er's father, Doctor Shen, is framed for murder, resulting in the whole family being executed. The murder is actually premeditated, however, and carried out by a good friend that betrayed Doctor Shen. Because of this, Zhao Er's entire family dies in vain, but she's saved during the course of execution, and she survives.
Zhao Er diligently studies medicine so that she can enter the Ji official family home to investigate the plot behind the execution of her family.
When she finally makes it into the Ji family manor as the doctor of Ji Heng's fiance under the disguised name Tian Qi, a series of twisted murders and conspiracies unfold before her very eyes to test both her wit and knowledge in order to save herself and the ones she loves.
(Source: thicca at MDL)
~~ Adapted from the web novel "Your Majesty Please Calm Down" (陛下请淡定) by Jiu Xiao Qi (酒小七).