Top Secret is the debut solo single album of Jun Hyoseong, a member of South Korean girl group Secret.

The album was released on May 12, 2014 with the song "Good-night Kiss" serving as the lead track.

[2] On May 7, the music video teaser for the title song 'Goodnight Kiss' was released.

Jun Hyoseong promoted the single Goodnight Kiss, as well as Lonely Night in music shows in May 2014 on KBS's Music Bank, MBC's Show!

She also held a MelOn showcase on the day of her album release.