The drama tells the story of Hoon-nam, a non-love advocate who refuses love, and Jung-eum, who dreams of love but becomes a love giver due to the cruel reality. After meeting, they help various people who are not suitable for love to fall in love and gradually approach true love. Namgoong Min plays Kang Hoon-nam, an expert in love theory. He has become a love expert who is proficient in love because of his warm appearance and innate charm, but he is not interested in true love and is expected to show the charm of a cold man. Hwang Jung-eum plays the role of Yoo Jung-eum, who has the same name as her. She is a former diver with elastic legs and soft appearance formed through sports training. Choi Tae-joon plays the role of a doctor in a rehabilitation clinic full of "cute pet" charm in the drama. He is the "male friend" of the envied heroine Jung-eum. He is a handsome, kind, gentle and affectionate doctor. He is very popular and has always maintained a close relationship with Jung-eum like a lover and a friend. Oh Yoon-ah plays the role of "Coach Yang", the coach of the diving team.