SM artists such as Girls' Generation members YoonA, Yuri, Seohyun, and Hyoyeon can be seen posing together backstage at Taeyeon's solo concert. 

In addition, TVXQ's Yunho and Super Junior members Leeteuk, Eunhyuk, and Donghae held up glowsticks and banners, showing support while emitting a friendly vibe.

The caption read, "My precious, one-of-a-kind people."

Meanwhile, Taeyeon held 'The Magic of Christmas Time' solo concert on December 22-24 at Kyunghee University's Peace Palace in Seoul.

하나밖에 없는 소중한 사람들

A post shared by TaeYeon (@taeyeon_ss) on Dec 25, 2017 at 3:20pm PST

늘 옆에 있어준 소중한 내 사람들 사랑하고 고마워 진심으로.

A post shared by TaeYeon (@taeyeon_ss) on Dec 25, 2017 at 4:19pm PST