Cold-faced CEO Lu Chenyuan carries the bizarre curse of turning into a corgi at midnight: human by day and a dog by night, guarding his secret in loneliness for years. Gentle junior employee Su Wan takes in a shivering stray puppy on a rainy night, warming its cold fur with hot soup and companionship, while quietly knocking on the locked doors of his heart. By day, he is a restrained and stern superior, secretly protecting her safety; by night, he is a clingy and protective corgi, acting spoiled, getting jealous, and never leaving her side. When the secret is revealed, unrequited love across different statuses turns into a two-way journey towards each other; he breaks the shackles of fate with true sincerity, and she responds to all deep affection with tenderness. Day and night have boundaries, but love has no borders, healing every lonely heart.