As soon as she entered the palace gate, which was as deep as the sea, she felt as if she were the concubine of the crown prince who was favored by many. The prince ascended the throne and sealed the six palaces. But she was just a noble concubine, far away from the queen. The arrogant concubine Yi, the charming concubine, and the 20 concubines with deep palaces, fell down one by one and stood up one after another. Who is the mastermind behind the scenes, and who can stay in the quagmire of the nine-layered palace again and again? How will the sincerity she has always believed in become rusty and cracked over the years...