Girls' Generation's Taeyeon and Tiffany are well-known to be best friends, which means that they aren't afraid to be straightforward about each other sometimes. 

On the October 31st episode of Taeyeon's reality show 'Taeng9Cam', Tiffany made a surprise visit to Taeyeon's music show rehearsal for her debut solo song "I". Tiffany said,"I wanted to come earlier, but I understand that Taeyeon couldn't help but be sensitive. That sensitivity turns into focus and energy on stage. I wanted her to be very focused, so I only sent text messages."

Taeyeon commented, "I didn't know Tiffany would come. She's like a mother-in-law,"referring to how mother-in-laws are known to make sudden visits.

Have you been keeping up with 'Taeng9Cam'?