Taken from my friend CAP_Loves_Niel  



[Lee Jeong for OBS Plus] Teen Top’s maknae Changjo got a shock when his first kiss was stolen mid-broadcast by his team-mate Niel.

It happened on MBC Music’s real men’s verification program “Teen Top & 100% Rising Brothers.”

Before beginning the men’s verification mission, Teen Top, led by Niel, played the “pass paper from mouth to mouth” game at the “Brothers House” temporary dorm.

While the game in which they were showing off their ability to react quickly was in progress, Niel missed the paper and brushed (his lips) against Changjo’s mouth instead.

Changjo proceeded to sink down in his seat, saying that Niel had stolen his first kiss and having a meltdown, to which Niel as well was unable to hide an embarrassed expression on his face.

Besides Niel and Changjo, other members’ mouths met as well, making them about to start crying, and in this situation of indiscrimate kisses caused by excesses of passion, the Teen Top members’ power supply received a shock, causing them to be unable to continue filming for a while. 
(*)

Meanwhile, you can see Changjo and Niel’s dizzying kiss and find out who else ended up kissing each other through the broadcast on the 7th (of December) at 6 p.m. of MBC Music’s “Teen Top & 100% Rising Brothers.”

(Photo from MBC Music)

Okay, I'll say this before anyone says anything. 
Personally, I do not blame any of them for reacting the way they did. 
That being said, I'm guessing most of them have never been kissed before that 's why some of them got very upset and couldn't finish filming. 
One thing that me glad was that the filming crew didn't freak out on them for their reactions. 
~Kaza