Actress Shin Da Eun revealed a shocking secret of Lee Kwang Soo, catching much attention.

On SBS "Running Man" aired on February 1, Shin Da Eun appeared as Lee Kwang Soo's friend. Lee Kwang Soo did not know what to do the moment Shin Da Eun appeared.

Yoo Jae Suk asked Shin Da Eun, "Where you in a 'some' relationship with Kwang Soo?" and she replied, "I wasn't but Kwang Soo thought we were."

Lee Kwang Soo said, "No" but Shin Da Eun yelled at him saying, "Hey, you confessed to me last time!," turning the filming studio into a pandemonium.

At this, Lee Kwang Soo said, "I did confess to her. But it wasn't that type of confession."