TST, formerly known as Top Secret (Korean: 일급비밀; RR: Ilgeubbimil), is a South Korean boy band formed by JSL Company (now known as KJ Music) in 2017. They debuted on January 4, 2017, with Time's Up.
TST, formerly known as Top Secret (Korean: 일급비밀; RR: Ilgeubbimil), is a South Korean boy band formed by JSL Company (now known as KJ Music) in 2017. They debuted on January 4, 2017, with Time's Up.