An Ran, a modern-day overworked office worker, transmigrates by accident into the body of a palace maid in the Cold Palace and is forced to bind herself to a thoroughly useless “golden finger”: she experiences the intense emotions of people around her as physical pain. From the start, she finds herself in hell mode, face-to-face with Emperor Jingyao, a tyrant notorious for his volatile temper and mass killings. In the Huaguang Hall, where everyone lives in fear, An Ran uses her ability to detect a faint flicker of “curiosity” in the emperor’s emotional wasteland. Her quick wit wins her a promotion from laundry maid in the Cold Palace to a maid serving at the emperor’s side. She can sense his “irritation” and “loneliness” in advance, soothing his emotions with a cup of hot tea or a bowl of dessert. She even risks her life to shield him from a poisoned arrow in the imperial garden, saving him from danger. This earns her his absolute trust. He grants her a token representing imperial authority and promotes her to head maid, making her the indispensable “human sleeping pill” and most secret weapon of Emperor Jingyao. But An Ran’s rise threatens the interests of the most powerful figures in the harem. Her relationship with the emperor gradually evolves from mutual exploitation into a journey of salvation for them both. An Ran sees through the tyrant’s shell to the lonely, wounded soul beneath, while Emperor Jingyao finds in her a level of understanding and peace he has never known before. He repeatedly defies the Empress Dowager for her sake, openly stands up for her, and keeps her safely under his wing. By this point, An Ran has gone from a wage slave who only wanted to survive to someone caught in the heart of the power struggle, the emperor’s sole emotional anchor and most guarded vulnerability. Together, they are about to begin their fight against the darkness of the palace.