TST of group has changed 180 degrees.

TST’s fourth single "COUNTDOWN" was released on various music websites at 6 p.m. on Jan. 2.

"COUNTDOWN" is a song that offers a glimpse of TST’s sexy and intense appeal, and tells the story of finding something precious in your dreams and starting from reality.

In particular, songwriter Kim Seung-Ho who participated in Eric Nam's 'Honestly', new songwriters Park Gun Wook, EXO, Girl's Day, Ailee, and writer Oh Yoo Won, who created the choreography of hit songs by idols Choreographer participated and improved the perfection. JUNG HOON, a member of the group, also took part in the rap makeup and captured the TST-like look. 

TST, who has performed songs and sword dance that are full of fresh charm, attempted another transformation through this activity. The more intense performance captured the public, expressing both basic and previously unheard of sex and charm.

TST, who has returned to their mature stage, participated in Mnet’s "M Countdown," which aired on Jan. 2, and also unveiled their new song stage for the first time. 

TST is going to continue their activities as soon as ‘COUNTDOWN’ is announced.