KBS new drama "School 2013" revealed its behind-the-scenes ambience.

In the photos, the actors are all posing for the camera with bright faces and obviously seem full of energy and ready to make a great drama. 

Lee Jong Suk and Kwak Jung Wook, who is opposing characters in the drama, is seen arm over shoulder and friendly with each other. 5dolls' Ryu Hyoyoung in her work out clothes seems very cute and Park Se Young, known for her beauty, definitely seems like a 2013 student.

Because the drama mostly takes place in a school, the actors have been spending a lot of hours with each other, whether they like it or not and many of them have already gotten so close and are showing great teamwork.

One insider said, "Because there are so many young actors, the set is always full of energy and generally very positive and enthusiastic, which is really great for everyone. It really does seem like a high school class, which will work very well for the drama as well."

It premieres on December 3rd.KBS,