If you want to live, shut up. Don't say what you know and don't remember what you hear. Their world was surrounded by secrets, until the day they were put into the coffin with doubt, all the records about themselves disappeared, and this is the palace maid. In the Korean era, in the murderous palace, except for the emperor, other people could not even choose to die. The palace maid Yue Ling (Xu Yingji) is found hanging on the beam, and the intelligent Qian Ling (Park Jin-hee) is suspected of being killed by him after the examination of the body. In order to get justice for the dead Yueling, Qianling decided to pursue the matter to the end. She further found out that the moon girl had given birth to a child, but her whereabouts were unknown, and apart from that, there was no clue. On the other hand, Shanggong ordered all the maids to hide the suicide, and only the maids who concealed the truth lived in a labyrinth-like conspiracy. Zheng Ling (Quan Huizhen) gives Qianling the love letter she wrote to her lover. Qianling wants to know more about the whole story, but Zheng Ling seems to have a tacit understanding with whom she doesn't say a word. The rumor of the mysterious death of the palace maid is getting bigger and bigger like a snowball. In order to show her "good leadership", Shang Gong made public all the maids who behaved differently.