On the night when the fire engulfed Jiangling, eight-year-old Ye Liushuang was fed "Wangyou Powder". When she opened her eyes again, she was Lin Shuyue, returning to the Lin family in the capital with her mother Wang Xuerou.
In front of Qiwu's residence, his biological father Lin Ruoxian took his beloved concubine to seize the property. Lin Shuyue appeared in the Zhu family's account book and showed his sharpness. The spice shop Lanxuetang is the foundation for her and her mother, but it is also involved in the fire of Ciyun Foundry and the suspicion of rape. The fall of the Salt and Iron Division and the pursuit of the Shen family follow closely.
King Song Yi of Yan, the emperor's fourth son, secretly investigated the case and sought the throne. He was struck by the fierce swordsmanship and the familiar mole under his right eye - she looked very much like the girl he had been searching for for many years and who gave him the only light when he was young.
Forming an alliance is an expedient measure, but also a secret emotion. He used her mother Wang Xuerou's personal network to stir up trouble in the court and attack the prince and the Shen family; while she used the clues he provided to follow the Jiangling Mutiny, old cases of the Ye family, and flashbacks in her mind, approaching the tragic life experience she had forgotten.
When the poison of "Wangyou" is about to explode, when the mask of "Lin Shuyue" is revealed, Ye Liushuang's memory revives in the cold pool and fierce flames. The bloody feud at Duke Anguo's house, the truth that his mother Yan Yuwei risked her life to protect him, and Song Yi's deep-rooted fear of "foreign relatives" under the throne... Are all revealed.
His chess-playing hand had saved her from fire and water, and he could also put her under pressure for power. She is the white moonlight in his heart and the most dangerous variable on the chessboard. In troubled times, love and hate are intertwined, and under the grinding of the gears of power, who can truly hold on to that pure light? The remaining moon among the embers, is it the ashes of destruction or the rekindled fire?
Purpose: Under the gear of power, no one can survive alone. The game of love and ambition will eventually swallow up all pure light, reflecting the struggle and choice of human nature in desperate situations.