The maid in charge, Shen Yan, has assisted the Seventh Prince Chu Ningyuan in seizing the heir since she was a child. The two, who also had tragic experiences, became cold-hearted in order to seek revenge and seize power. They are used to seeing the dark, and the few warmth is only left to each other. Chu Ningyuan gradually fell in love with Shen Yan who was always by his side, but Shen Yan was indifferent to his love, and even took the initiative to match Chu Ningyuan to marry the daughter of a powerful minister in order to destroy the prince's plan to stabilize his power by choosing a concubine. Chu Ningyuan saw Shen Yan's intentions in his eyes, and became more paranoid in his actions, determined to keep Shen Yan by his side.