Lee Kwang Soo has revealed that in reality, Kim Jong Kook sulks when things don't seem to go his way on 'Running Man'.

Lee Kwang Soo, who has brought many laughs with his witty comments and dorky behavior on 'Running Man', was featured on March 27th's broadcast of SBS 'Bae Ki Wan, Choi Young Ah, and Cho Hyung Ki's Good Morning'.

On this day, Lee Kwang Soo was hard at work filming a commercial with Baek Jin Hee and Kang Seung Yoon. He impressed viewers with his passionate acting, despite there being no music, as well as with the makeup he was seen wearing for the occasion.

Lee Kwang Soo brought laughter to the set when he revealed, "I didn't tell the hyungs that I was filming a commercial today because I was afraid they were going to ask me to treat them out."

He revealed a hidden trait about Kim Jong Kook saying, "If you attack Kim Jong Kook on 'Running Man', he'll actually sulk."

Source & Image: TV Report via Naver