By ad-lib, I am referring to when Tae & Fany sing at the end, while the final chorus is being played. They are improvising while singing, in essence, which is an ad-lib.
By the way, the look Sooyoung has in the MV...*dies*
And the guy is Choi Siwon of Super Junior, for those who may be wondering.
*returns to spazzing*
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