Leeteuk brought up a slightly dark part of his past, a forgotten period before he officially became a part of Super Junior on the December 17 airing of 'I Can See Your Voice.'

The show featured Wheesung and the hosts along with the guests got to discussing the early 2000's, particularly the year 2002 when the World Cup was taking front and center. Wheesung and Leeteuk all recalled that no one spared even the slightest bit of interest in the music scene as everyone was too busy following the World Cup. 

Leeteuk in particular brought up a painful memory of when he had tried to debut under a group called Smile but things didn't quite go the way he wanted. He confessed, "I was also trying to debut in 2002 but failed," to which Wheesung responded, "Was it a time when you were simply Park Jung Soo and not Leeteuk?" An embarrassed Leeteuk answered, "Our group was called Smile. In the end, we never smiled," drawing laughter with the witty way he poked fun at himself.