In the deep palace of Apocalypse, shadows lurk.
The seventh princess, Shen Ci, is the most inconspicuous person in the palace wall. Her mother and concubine died young, she is timid and taciturn, and allows others to bully her. No one knows that under this weak body, there is hidden the soul of "Shadow", the top killer of "Silent Pavilion" - with the implanted false memory, she carries the secret mission of assassinating the "traitor" and explores alone in the fog of the deep palace.
According to the Queen's decree, Xie Heng, the son of the guilty minister who returned from exile, became her companion. He is as gentle as jade and knowledgeable, but there is a bottomless undercurrent hidden in his eyes. As the undercover "Jin" of another force, he knew Shen Ci's true identity and approached her to protect the target and to find out the conspiracy of the "Silent Pavilion".
One is a cold-blooded killer wearing a cowardly mask, and the other is a deep undercover wearing a warm coat. They tested each other, guarded against each other, and worked step by step amid the struggle for imperial power and the confrontation of forces. When false memories collide with the real past, when mission goals overlap with the mystery of life experience, when undue trust breeds in suspicion, who is the chess piece and who is the chess player in this palace game with life as the bet?
"You and I are both people wearing masks, how can we be sincere?"
"But, in this endless hell, I believed you."
