A twenty-four-year-old Shin Ji-hoo, after a painful experience with her first love, is afraid of any relationship, but after landing a job she falls in love with her charismatic boss Oh Tae-su. Unlike Ji-hoo, he has a lot of dating experience, and the man is quite cynical when it comes to love. He is not only handsome, but he flirts with the object of his attention in a casual, effortless way, which makes him practically the ideal man in the eyes of any woman. However, spending a lot of time with naive Ji-hoo, this twenty-eight-year-old Casanova changes his views on matters of the heart.