Krystal Jung don't know anything about love. She don't know how to be romantic, she still doesn't have her first kiss yet, she never been into any date, She don't know how it feel like when people are madly in love. Let's just say, she's noob. She have a loving family. Her family are not come from a rich family but yet they still tolerance each other

Kim Jongin or more prefer to be called Kai is a famous bad boy at his school. He flirt, socialize, alcoholic, player, troublemaker , has a lot of girlfriend that he even didn't remember which one is his girlfriend. He didn't care about what people think about him, what his ex feeling after being dump one by one, he didn't care about anyone in this world. His mother left their family for another guy while his father is the only one he have but still his father didn't love him as much as he love his sister. He hate his family although they were rich.

Both of them are totally different but what make them together?