Jang Hye Min discovers a dirty boy in front of her house. She gives him a hard knock-out because he keeps following her, asking for a meal.
When mom comes back home and sees a mess of a boy, she lets the boy to stay, thinking Hye Min did something.
The only the thing the boy remembers is "Hye Min."
"Stop stalking me! You can only be my dog boy but nothing else!"
"I will become your slave, your loyal dog, and listens to everything you say. Anything, anywhere. No matter what, I will protect you!"
But Hye Min is slowly having feelings for the boy ... and what about his identity?