As the main vocal of a band, Jiang Siwang (starring Aaron Kwok) is always the “coolest dad ever” to the eyes of his young daughter Jiang Lu. On the day right after Lu’s ninth birthday, Siwang accidently falls into the water when trying to save a puppy, and disappears from Lu’s life since then. But the magic happens because of love. Siwang mysteriously gains an “extra life” to be with his daughter: he transforms into a dog and returns to Lu, who has become an adult with a very different personality, now going through tons of crises in both her career and marriage. Even as a dog, Siwang will try the best in his way to protect his dearest darling.