TST, the group, will return with a stronger concept. 

On Dec. 23, a teaser video for the new album "COUNTDOWN" and a group image were released through the official social networking service channel of the TST.

In particular, group images show unique concept digestion with check-pattern suits and colorful styling, or show off the eye-catching four-color charm, which also stimulates fans.

Through this album, TST is raising curiosity by announcing a new transformation that is 180 degrees different from the previous one. 

"COUNTDOWN" will be released on various music websites at 6 p.m. on Jan. 2, 2020.