Cha Jin Wook (Sung Hoon) is the son and heir of a wealthy family. His family owns one of the largest companies in the country. He is a second generation chaebol, he is indifferent as he is callous, He loves to have fun. He is the typical rich playboy who only has one night stands, he is a man that every woman is crazy about, but he has no feelings for neither of them and always enjoys hanging out at parties and clubs, he enjoys being the center of attention wherever he goes.
Lee Yoo Mi (Song Ji Eun) is a 25-year-old young single woman, with a cheering personality that doesn't do much with her appearance, as she doesn't wear makeup or even bother to dress up nicely, she is very informal and unconventional. Her mother was an erotic actress, and that changed her life from the moment she found out. Due to the bullying, she received at school, she began to dress conservatively, which is why she shows such a modest appearance. She had never had a date before, so she is surprised at herself when she meets Jin Wook and spends a single night with him after being delighted by his cunning and playful personality.
After having a one-night stand, she disappears quickly in the morning, something that bothers him, as he knows absolutely nothing about her, not even her name. But as if it had been the work of a magical spell, he suddenly began to change, going from a cunning playboy to a workaholic businessman who does not enjoy the pleasures of life.
Three years later, both are surprised when she introduces herself as the new nutritionist at a cafeteria inside his company. Although she pretends not to remember him, they can't avoid the physical attraction, and memories of that night, both are beginning to wonder if that encounter that began as a nightstand could lead to a more meaningful relationship.
Jung Hyun Tae (Kim Jae Young) is 28 years old and owns a bookstore that sells coffee and beer. He and Yumi are childhood friends. He has feelings for her, but unfortunately for him is an unrequited love.
Joo Hye Ri (Jung Da Sol) is a charming young lady who grew up in a very conservative family that made sure she was well educated and trained. She has been in love with Jin Wook for 12 years and is convinced that she will become his future wife. Nothing will stop her in becoming that dreams a reality.