TREI (트레이) is a three-member boy group under Banana Culture. They officially debuted on February 19, 2019 with the mini album Born ; 本.
TREI began as a duo composed by Lee Jae Jun and Chae Chang Hyun. In August 2017, they released a digital single called “Up” and a few months later, they joined the survival show MIXNINE.
In May 2018, Kim Jun Tae was announced as new member of the group. In sequence, they dropped their pre-debut single “Nike”. On December 14, Banana Culture stated that the group is preparing for their debut in the beginning of 2019.
On February 1, their agency confirmed their debut date to be on February 19 with their first mini album, Born ; 本.
Source: kpop wiki