A noble concubine who was born as a slave, after a civet cat exchanged for the prince, bought a baby boy to replace her. She found out that the baby she bought was actually a baby girl, and raised her to live a stable life as the well-known idiot prince.
The emperor knew everything from the beginning, and carefully planned to fake his death to pass the throne, and summoned the regent who he and his concubine had raised since childhood to return to the capital to assist her in her ascension to the throne.
The poison left behind by the late emperor bound the two of them, and the regent also learned the secret that she was actually a daughter.
When the revelation of her daughter's identity leads to her being forced into the palace, the mystery of her identity ensues, and the late emperor appears to reveal the full plan.
After the storm subsided, she was crowned empress, and the concubine's separated parents and children reappeared, revealing the old secrets of the palace...
