As the daughter of a convicted official, Shen Qingyi willingly enters the Jing'an Marquis Manor as a concubine to investigate her father's wrongful case. Upon entry, she is forced to enter through the side door and her late father's legacy manuscripts are trampled upon. Enduring with forbearance, relying on her fine handwriting and meticulous observation, she plots step by step amidst the legal wife's schemes and the concubines' frame-ups. From a cup of scalding tea and an intercepted old letter to a forged manuscript in green smoke and the Liu family's private seal, she untangles the threads one by one, peeling back the layers of the Liu family's literary prison conspiracy from twenty years ago.