Production assistant Lin Zhiyou never got over her ex Wen Yan, who left her, leaving only her pup Nuonuo. Wen Yan flies back, but a bizarre accident swaps their bodies: the ex lives as her puppy, while Nuonuo roams in his human form. Stuck cohabiting, they hunt for a way to swap back, fight rumors, and untangle the misunderstanding that tore them apart, rekindling their love.