Yaoyao, a koi fish from the celestial realm, accidentally drank immortal wine and slipped down to the mortal world, opening her eyes to find herself the legitimate daughter of the general's residence, currently being plotted against by her concubine stepmother and concubine sister. While still feeling the effects of the drug, a poisoned and cold-faced prince was slumped beside her. Raising her hand, she delivered a single palm strike to knock him out, flicking her wrists thinking about how he dared take advantage of this immortal fairy. Later, she discovered that speaking a kind word would bring others good fortune, and wanting to return to the celestial realm required accumulating merit through good deeds. The prince was dying from a poison outbreak, and she was determined to save him—saving him brought merit the fastest. A sweet yet violent koi fairy and a Qilin prince burdened by a bloody vendetta embark on a path of doing good deeds and slapping faces, turning the mortal world upside down.