Billlie 開始逐步公開她們即將發行的專輯《the collective soul and unconscious: chapter two》的更多資訊。
韓國時間4月17日凌晨，這支人氣女團發布了曲目列表預告，揭曉了所有即將發行的新歌名稱。根據列表，這張專輯包含12首新曲："Secret No More"、"ZAP"、"WORK"、"TBD"、"Beyond Me"、"Soupasta"、"Off-Air"、"ZAP (ultraviolet remix)"、"WORK (anonymous remix)"、"Soupasta (unconscious remix)"、"Domino Butterfly Effect (Korean ver.)"以及 "Cloud Palace (collective soul remix)"。
與此同時，Billlie將於5月6日發行她們的首張正規專輯《the collective soul and unconscious: chapter two》。
常見問題：
問：4. Q: What was Secret's debut song? 答： A: Secret's debut song was "I Want You Back," released in 2009.
問：5. Q: Did Secret win any awards for their debut song? 答： A: Yes, Secret won the Newcomer Award at the 2009 Mnet Asian Music Awards for their debut song.
問：7. Q: Has Secret released any albums? 答： A: Yes, Secret has released several albums, including "Moving in Secret," "Secret Time of the Day," and "Letter from Secret."