Yong Hana is an ordinary 16 years old half-Korean and half-Japanese teenager living in an average life. She, together with her mom stayed in Korea for the past 13 years since her father died. She doesn't have any boyfriend since birth and is willing to wait for the 'right one'. During summer, she met a guy name Nam Woohyun whom she fell in love with at first sight not knowing that he is her cousin. Woohyun has the perfect face, body, height, voice and perfect smile that straightens everything.

When she knew, her world almost stop knowing that his dream boy is her cousin. Later on, he invited her to go back to Japan to study. There, she knew that his personality is not like what she pictured.

At the first day of school, she met a guy named Kim Myungsoo who tried to kiss her. Myungsoo is quiet yet annoying person who often drinks alcohol and didn't attend classes, believing that he's already smart enough. He love to tease Hana. He's one of the most influential person in the school campus and in the internet world being the most spied non-showbiz person. He's Woohyun's step-brother and tries to make things complicated between him and Hana.

Woohyun on the other hand is smart, cool, clumsy, annoying and sometimes rude. He often fights with Hana and insult/. He's one of the most famous artist/model in Japan being the most influential person in their country. He hates his brother and will do anything to keep Hana away from him. He also make her confuse all the time.

One day Hana captured almost with one of her cousin, only wearing blankets. Ofcourse the people didn't know that they were blood-related. To them she is a stranger, who is willing to sleep with anyone. The news spread easily. And in order to protect her reputation, one of her cousin was convinced to have a 'fake' engagement and make it real in front of all people.