"We're preparing really hard for the concert. It'll be fun," Kim Jong Kook told listeners, heightening the anticipation.
When asked if there were any potential stars on the guest list, Kim Jong Kook responded, "There is someone who has been confirmed. We can't announce anything yet. HaHa and Lee Kwang Soo are coming for sure. Cha Tae Hyun attends every time as well."
Who do you think the unnamed guest may be?