Choi Kristi made a vow that she'll never fall in love. She believes that it's too much trouble and you don't need to fall in love to be happy. As Kristi gets home one day, she is meeting her worst fear. Two handsome twins has came to live with her! Jo Youngmin & Jo Kwangmin. Twins from a popular group from school called Boyfriend. Thinking that it won't be too much trouble or maybe it will be. Kristi still vows that she won't fall in love, yet... She could be wrong.