Rofl, he can’t contain himself at all. Even Hyuk is able to keep his laughter…to a minimum, at least XD. The uploader of the video explains why Teukie is cracking up so much:
he falls again at 1:09………. for this quiz section they called out to this listener who is a teacher. ahem, but she gets all the answers wrong. XD
So while Hyuk is reassuring the teacher, Teuk is falling off his seat and laughing his head off. SUCH A DORK.
And while we’re at it, take a look at this:
What a kiddo at heart ^^.
Credit: ccherjr
herKPOPobsession 
Ahaha he’s so cute! Loves SUJU!