BTOB member Lee Chang-sub will release his first Korean solo album Dec. 11.

Cube Entertainment, representing the singer, uploaded a teaser image of the album, titled “Mark,” Friday.

Cube Entertainment

In the teaser, the singer appears in a tartan coat with his hair slicked back. Only half his face is visible, adding to the mysterious mood of the sepia-toned image.

Chang-sub previously delighted fans with his vocals in the self-produced solo song “At the End” and the Japanese solo album “BPM 82.5.” The singer’s well-known musical gifts have created high expectations for “Mark.”

“Mark” is slated for release Dec. 11 at 6 p.m. on various online music-streaming channels.

By Lee Tae-hee (taeheelee@heraldcorp.com)