Song Joong Ki recently showed off his close friendship with Lee Kwang Soo as he jokingly dissed his looks, bringing about laughs.

A behind-the-scenes video of the drama 'Nice Guy' appeared on its main website with the title, "Nice guy Song Joong Ki exposes secrets?" The footage took place in Joomoonjin, where character Kang Maru (Song Joong Ki) went to go find his younger sister Kang Choco (Lee Yoo Bi).

While Song Joong Ki was parading Lee Yoo Bi with compliments, he suddenly stated, "She goes to clubs a lot so you will be able to meet her if you go to clubs on Friday nights," as she burst into laughter.

Lee Yoo Bi tried to defend herself as she laughed stating, "It's not true. Joong Ki oppa said clubs were fun so I was only thinking about going."

He also used the opportunity to poke fun at Lee Kwang Soo as he continued his joke with, "When you leave the club around 2:00 AM and go to Chungdamdong, you will find Lee Kwang Soo. Kwang Soo is too ugly to be allowed into the clubs so he sits outside and drinks soju," making viewers laugh.