SM Entertainment released a statement on November 1st detailing what exactly happened, stating “The program MC wanted to talk while watching the Girls’ Generation music video being shown on the low monitor. Taeyeon was showin on screen naturally resting her chin on her hand while watching the monitor” and that “We hope there are no other misunderstandings.”
Also, “That day, Taeyeon and Yoona, as well as the other members’ conditions weren’t very good, but they appeared on the show of their own volition and, along with the fan meeting schedule afterward, did their best to digest their schedule.”
Source: Newsen