As previously reported, TREI used to be a hip-hop duo who debuted in 2017 before the two members took on the idol survival show 'MIXNINE'. Since then, they've added a new third member Kim Jun Tae in order to revamp and bring listeners upgraded music. 

In their individual teaser images, members Lee Jae Jun, Chae Chang Hyun, and Kim Jun Tae look laid-back in grayish tones, and gear up for their pre-release single "Age & Height". 

Check them out below while you wait for the full release of "Age & Height" on May 17 at 6PM KST.