hmmm...
* StreakInTheSky gets some popcorn and watches
okay, now put your hand lower >_>
anyways,
That's when they showed her the banner saying something like "We love Taeyeon(and some title I'm too lazy to look up)."
She didn't actually cry when they were being mean, but it did look like she was kinda upset about it.
She was probably supressing it and when she saw the banner she was filled with emotion and started crying.