On this weekend's episode of MBC's 'Mask King,' Leeteuk entered the judging panel with Park Si Eun!

The latter stated, "I will diligently open my five senses in hopes to do well."  MC Kim Gu Ra then said about Leeteuk, "Because he doesn't sing much in Super Junior, if anything, his ears have developed a lot.  I've brought Leeteuk."

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The idol leader stated, "I felt quite frustrated.  When I saw the panel saying who [the person behind the mask] was and match it.  After I stated on 'Radio Star' that I felt frustrated, the writer of 'Mask King' gave me a direct call, telling me to come on it and try my hand matching [the singer to the mask]. The thing that I was most frustrated about was wondering who it was from a viewer's perspective, so I will immediately match them.  I predict that I'd probably get about seven people correct."

Shin Bong Sun jokingly threw at him challengingly, "I want to see him thoroughly fall apart."