Jerry Shi won an online contest to spend the day with Taeyeon!
You can read it all here:
an afternoon with Taeyeon, a musing on fandom part 1/2.
Basically, they got to meet up with Taeyeon, go to an arcade with her (her idea!), and then get dinner and chat. They had a translator but one friend could speak Korean and Taeyeons English is pretty good so they could speak comfortbaly :)
It seems like a really lovely experience and the guys seemed really respectful and kind :)