The actors of 'School 2013' have displayed their close friendship that endures even outside the filming set!

On January 3rd,�Choi Chang Yup uploaded the pictures above onto his Twitter and along with it wrote, "At Jonghyun-hyung's place."

Kim Jong Hyun also wrote on his Twitter saying, "My friends from classroom 2 came over today. Ultra, best, great, giant, super, best feeling. I have to go to school tomorrow so I should sleep early tonight," referring to his co-stars and returning to filming for 'School 2013'.

The picture taken shows the actors of the trending drama gathered around and having a good time. Their apparent closeness had viewers of the show smiling.

On another note, 'School 2013' depicts problems that show up in school�environments to bring attention to �some of the issues that may be going unnoticed.