The twins, Ji Hyun and Ji Hye were happy when their mother finally remarried. But one problem is pulling them apart- Do Kyung Soo, their step brother. While Ji Hye has a hopeless crush on him that he doesn't notice, Ji Hyun didn't get along with him well. They hated each other like there was no tomorrow. But what will happen when they realize that they are starting to fall in love with each other as time passes?