Popular idol group MBLAQ guest-starred on 'Invincible Youth' and spent an enjoyable day with G7.
On the August 6th episode of KBS 2TV's 'Invincible Youth', MBLAQ helped G7 with gathering farm crops.
On this broadcast, MBLAQ member Lee Joon was tricked into a hidden camera by Kim TaeWoo. At first, Lee Joon and G7 had planned to hidden camera TaeWoo and trick him. The plan was to have Lee Joon taste raw eggplant while gathering vegetables and react to allergies.
However, because Kim TaeWoo was not easy to fool, he quickly found out that it was a hidden camera. He planned a hidden camera on Lee Joon next. MBLAQ and G7 thoroughly planned out how to trick Lee Joon.
Using the allergy as an excuse, Lee Joon was subjected to various folk remedies to treat his (fake) allergies and was tricked into a hidden camera. Kim TaeWoo's 'straight' face acting made Lee Joon flustered, and this was when they revealed that it was a hidden camera to him.
Love lines between the MBLAQ members and G7 were also shown. MBLAQ member G.O, especially, created a strange relationship with After School's JooYeon by doing a 'rifle dance'.
Also, MBLAQ member Mir told JooYeon that "If you want to catch G.O, right now is the best time", turning the entire filming into laughter.
SOURCE: Nate News
tl;dr: It was all fake. They tried to trick Taewoo with Joon faking allergies and it backfired because he noticed it was a hidden camera.