Secret (시크릿) was a
TS Entertainment girlgroup formed in South Korea in 2009 by
전효성 (Hyosung),
송지은 (Jieun), Hana and Sunhwa. Sunhwa ended leaving the group and TS in October 2016 before their disbandment in 2018. Secret was first introduced through a documentary program titled Secret Story which aired on Mnet. The program chronicled their debut process and aired their invitation only debut show case which took place on September 29, 2009. The MV for their debut digital single "
I Want You Back" was released on October 13, 2009 and they appeared on M! Countdown for their debu…
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