Dugu Qian, the daughter of the guilty minister, hid half of a jade pendant with a name engraved on it, and hid in the palace under the name "Su Qian". Possessing the power of an unforgettable memory, she investigates mysterious cases of broken porcelain and missing traces of ink scrolls in the dust. She gradually attracts the attention of Emperor Yu Wenshen and is promoted from a clerk in Yeting to a female official in charge of secret files.
Among the stacks of documents, she caught a glimpse of traces of tampering in her father's "collaboration with the enemy and treason" file, and Yu Wenshen's gaze turned from appreciation to exploration. When half of the jade pendant was put together, the thunder exploded as her identity was exposed. She was involved in the bloody mystery of the late emperor's death - in the imperial study room, the emperor faced each other with swords, and the cold light reflected her tearful eyes: "How many secrets do you still have?"
Corrupt account books for water transportation, poisonous weeds in the harem sachets, shadows of the old East Palace... In the layers of fog, the orphan girl and the Nine-Five Lord, on the edge of taboos between monarchs and ministers, test each other and redeem each other in the labyrinth of unsolved cases. From the rainy night in Ye Ting to the Jinluan Palace, she used her memory as a blade to open up the unjust case, and he used his authority as a shield to protect her. Finally, under the moonlight in Beijing, he turned half a lifetime of doubts into a promise to see all the flowers in Chang'an side by side.
