Apparently, Taeyeon just entered the departure hall in Singapore Airport 20 minutes ago. So if you still wanna catch her flight, you better go NOW! Source: Confidential.
Have a friend heading to the airport at this moment, will update back with news! No update still as of 10:27PM SG Time.
Update: Taeyeon has not been found in the airport, but his dad is spotted.. well at least 99% sure.