Brian of Fly to the Sky joined the line-up of impressive artists who have been contributing to SBS’s Protect the Boss OST.

The official album, which is set to hit the shelves on September 8, has already sold 30,000 pre-order copies, even though most of the songs have already been released as digital singles. The final song, I Can’t Go, sung by Brian, was unveiled on September 7.

After the song was released as a digital single, the singer began personally promoting the song, tweeting, “Please show your support for my song, I Can’t Go from the Protect the Boss OST. It’s the theme song of Jae Joong. ^^"

The other songs on the OST include, Let Us Just Love by A Pink, I’ll Protect You by Kim Jae Joong and Sad Song by Heo Young Saeng.

Photo credit: SBS