The girl group Mystyle, which has had a tepid career so far, announces on their third anniversary that they're going to split up in two. One team will be continue to be led by the original leader, the hot and sexy Windy. While the other team will be led by the cute and energetic newcomer Wang Shu. Wang Shu seems like a well-behaved girl, and she tries hard to get along with Windy day-to-day. But in fact, she seems to more than just friendly feelings for her senpai...