Tiffany's best friend is her brother, Donghae. No doubt about it. But when Jessica comes into the picture, a remarkably different girl from his exes, and she becomes his girlfriend, Tiffany's not judging his taste in girls anymore. Now she's the one admiring who he chooses. Both girls are questioning their uality as they sneak quick makeouts in the bathroom whenever they give in to temptation, and they have to choose between betraying Donghae, or living without each other.