Jin Wook, a rich playboy set to inherit his dad's company, has a chance encounter with Yoo Mi, who has more modest ambitions to become a nutritionist.

After sharing a night with Jin Wook, Yoo Mi departs, never to see him again. Three years later, she achieves her goal of becoming a nutritionist.

Yoo Mi struggles to meet the unreasonable demands of her boss. When she goes to apologize to him for a harsh e-mail, she runs into someone unexpected.

When Yoo Mi brings a meal to Jin Wook's office, she encounters him with Hye Ri. Hye Ri is jealous that Yoo Mi is cooking for Jin Wook.

On her day off, Yoo Mi takes her half brother Dong to Jin Wook's house to cook a meal. Once there, Dong accidentally breaks an expensive jewelry box.

Jealous of Yoo Mi and Hyeon Tae's growing friendship, Jin Wook makes Yoo Mi work overtime to prevent the two from spending more time together.

Yoo Mi agrees to pay for the jewelry box and medical fees by having dinner with Jin Wook 10 times. They schedule dates for after work and on days off.

During a business trip, Yoo Mi and Jin Wook stay at one of the company's resorts. Meanwhile in Seoul, the jealous Hye Ri pays a visit to Hyeon Tae.

When Dae-bok sees Jin Wook playing with Dong, he thinks that Yoo Mi and Jin Wook had a child. Jin Wook also begins to wonder whether Dong is his boy.

Hye Ri harasses Yoo Mi for stealing Jin Wook from her. Meanwhile, Dae-bok visits Yoo Mi's home to find out if Dong is his grandchild.

After deciding to quit her job, Yoo Mi leaves Seoul and moves to Daejeon to work at a university dining hall. One day, Hyeon Tae comes to visit her.

Yoo Mi Blames her mom for her misfortune and goes to the beach where she first met Jin Wook. He learns of Yoo Mi's whereabouts and they reunite.