Jong Suk(Lee Jong Suk), a goblin, who came to earth to complete a mission. However, on his way to Earth, he met into an accident and loss his memories. He then met this girl Ra Il(Park Shin Hye). Ra Il is an unlucky girl, she often had something unlucky happen to her whenever she is about to complete a task. She is also known as miss unlucky. Will he be able to complete his mission? Will they be together?