Her life experience is a mystery. She only knows that her benefactor saved her. In order to repay her kindness, she did not hesitate to sneak into the enemy's country as a spy to obtain secrets. While completing the task, the truth also emerged step by step. When the answer to the mystery was revealed and love and power could not be balanced, how should she choose? In a bloody palace battle of power conspiracy, how did the heroine sink and fall in the bloody murder?