Kang Haru is a poor college student who works many part-time jobs to support his younger sister and pay off family debt. One day, while making a delivery, he's given a card that says "Puppy Wanted." Misunderstanding, Haru finds a dog and brings it up to the hotel room Min Dowoon is staying in, but he is shocked to see Dowoon having sex with someone. Haru runs away, but Dowoon happens to become a visiting professor at his university. Dowoon hires Haru as his secretary and the line between work and professional begins to blur. However, Dowoon's abusive ex Jang Hyuk makes it hard for him to love again.