Lee Kwang Soo will be making a special appearance on the upcoming drama 'Descendants of the Sun' for his best buddy Song Joong Ki. 

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On February 23, KINGKONG Entertainment uploaded a video on their official YouTube channel of Lee Kwang Soo shooting for 'Descendants of the Sun'. 

In the video, Lee Kwang Soo is wearing a military uniform with a red hat that reads 'Instructor'. It is heard that Lee Kwang Soo has shown professionalism as an actor as he carefully went over the script, and was sincerely putting his effort into acting.

This special appearance of Lee Kwang Soo is to support his best buddy Song Joong Ki. On the first episode of 'Descendants of the Sun', Lee Kwang Soo will appear as a part-time job employee that Song Joong Ki and Jin Goo runs into. 

This first episode of 'Descendants of the Sun' with Lee Kwang Soo will be aired on February 24.