Min Gyu is a warm-hearted and cheerful animal-loving veterinarian. However, the animals in his care have many problems and diseases. This causes trouble with his girlfriend, Wha Young. She gets really frustrated by the constant irregularities of his life and starts dating other men. Eun Hae is a cheerful and proud photographer who has been going out for quite a long time with a libertarian artist, Jin Woo. But Jin Woo starts to date the museum curator Wha Young and Eun Hae becomes so angry that she decides to contact Wha Young's ex-boyfriend, Min Gyu, suggesting revenge. However, Min Gyu and Eun Hae begin to feel more interested in each other than in the process of revenge.