Pet variety show production assistant Lin Zhiyou and her ex-boyfriend Wen Yan regretfully broke up due to a long-distance relationship, leaving only the little dog Nuonuo to accompany her. Wen Yan returned to China overnight to beg for reconciliation, when a sudden accident surprisingly caused him and Nuonuo to swap bodies! The once cold ex-boyfriend turned into a little dog, crazily jealous and sticking to her step by step; the little dog Nuonuo took over Wen Yan's human body, causing endless trouble and hilarious chaos. The two were forced into a bound cohabitation, exploring the secret of swapping bodies back while fighting against malicious rumors in variety show recording. Beneath the hilariously funny daily life, the misunderstanding of their breakup back then is slowly revealed. Crossing the wonderful bond between human and little dog, the two shed their barriers and fell in love again.