The story is about an asassin named Tiffany Hwang who fell in love. Her orders were to kill a man named Jang Wooyoung . Instead of killing him she fell in love with him. She went ahead to go and follow him around. Wooyoung started getting the feeling that some one was watching over him. After a few years pasted Wooyoung also Fell inlove with Tiffany, both of them told their friends Yoona and Taecyeon . They boTaecyeon disagreed but they went on a date any way. In the end you'll be upset.