Ji Hyo suddenly comes to Jong Kook one day with a mysterious predicament she refuses to tell him. It marks the beginning of a journey in which they find themselves trying to define the boundaries of their relationship. How far are they going to push each other before one cracks? Will Jong Kook change his destructive shy personality with girls? Will Ji Hyo be able to escape from the shadows of Baek Chang Joo? What is the meaning of their friendship?