Lee Kwang Soo faced embarrassment in front of various SNSD members on "Running Man".On the episode that aired on the 2nd, Lee Kwang Soo was paired up with SNSD member Yuri. The couple teamed up with Yoo Jae Suk and YoonA couple. The first mission was to ride couple bikes to a picnic area, eat the food there, and then bike back. Overwhelmed with excitement over being partnered with Yuri, Lee Kwang Soo speeded up intensely on the bike. While running to the finish line, he saw that he was racing the other team's Jessica. He tried to go down the stairs in one step at that moment, he lost his balance, and his legs got a bit wobbly and loose, which caused him to fall. Thus, he did not make it to finish line, causing his team to lose.
Before Yoo Jae Suk could explain what happened, Lee Kwang Soo asked him, "Please don't share this." After speeding up so much on the bike, from his excitement, he lost strength in his legs and they became a little loose. Yuri and YoonA could not hide their laughter about the situation, which made Lee Kwang Soo even more embarrassed.Source: Hankooki via Naver