Ye Wange, an amnesiac, nearsighted female assassin, is ordered to assassinate Shen Mochen, the ruthless prime minister, and investigate the fate of her senior sisters who previously disappeared during assassination missions. She infiltrates the prime minister's residence, deliberately wins his favor, and becomes his maid. However, she discovers that her missing senior sisters are imprisoned in a secret chamber. Unable to rescue them in time, she has no choice but to get closer to Shen Mochen. Meanwhile, the truth about Ye Wange's identity gradually comes to light.