After Jiang Hao's beloved dog, Snowball, is hit by a car, it somehow swaps souls with the car's owner, Lin Yuan, and returns in the form of a handsome human. Jiang Hao thinks he has met a lunatic, but is shocked into believing him when he reveals secrets only a dog could know. The man and his "dog" set out to find a way to switch their souls back, only to discover that the dog's body has died. From then on, the human with a dog's soul and his owner begin a new life together, filled with laughter, tears, warmth, and sweetness.
