[This story is currently under editing.] Su Jin is a 17 years old spy, from an agency. She has a big scar on her right eye, and she refuses to tell how she got it. Of course, her close spy comrades know about it. Su Jin has always been a cold in the outside, but warm in the inside girl. She has a lot of secrets regarding her horrible past, but she just acts like a normal girl. One day, she gets a mission from her boss, which is related to a high school. She has done many missions before, but, this time, it's different. It's somehow related to her past, along with her spy friends'.