TST, formerly known as Top Secret (Hangul: 일급비밀; RR: 'Ilgeobbimil') is a South Korean boy band formed by JSL Company in 2017.[1] They debuted on January 4, 2017, with Time's Up.

The have won the 64.Your Sound Contest (YSC) with the Song Paradise.

Members Edit

  • Ain
  • K
  • Yohan
  • Wooyoung
  • Junghoon
  • Yonghyun

Past Members Edit

  • Kyeongha
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