Su Yao, a seemingly obedient illegitimate daughter of the Marquis's household, has endured ten years of bullying at the hands of her legitimate elder sister and the principal wife. Now her own father forces her to marry in place of someone else, sending her to Prince An, a man rumored to be cruel and perverse. Determined to escape her predicament, she reveals her claws and carefully plots every move. She wins the heart of the mysterious masked man Xiao Jingci and uses his power to free herself from Prince An, while systematically eliminating her elder sister and the principal wife. But who is hiding beneath the mask? None other than Prince An himself, the very man she desperately wanted to avoid! A battle of two equally formidable minds, beginning with mutual exploitation and developing into a tangled game of attraction and resistance, finally unfolds amid the twists of fate.