Park Hae Jin will be in the role of Yoo Jung, while Park Ki Woong will be in the role of Baek In Ho. The two were spotted filming for the characters' high school days, Yoo Jung giving off a more neat and classy feel while Baek In Ho turned into the type to fool around more. 

According to the staff, the two actors had perfect chemistry filming an important scene. Meanwhile, the movie's cast began filming last month.