She has a good personality, is popular, and has a lot of money: Gu Do-Yeon, the daughter of the perfect G company president. However, Do-Yeon's step-sister Gu Yi-Seo is just unlucky and annoying. Who in the world is perfect? In the end, Yi-Seo secretly hides in an office to dig up Do-Yeon's weakness. There, she discovers a completely different side...