CNBLUE revealed their comeback song "I'm Sorry" and part 1 of "Blue Teaser."

The short teaser revealed on CNBLUE's official YouTube channel shares the concept of the new release. It begins with a girl's voice stating, "It's over. I'm sorry," leading to the band's performance of the track.

CNBLUE continues their rock sound and it was previously revealed that Jung Yong Hwa has written and composed the track building the anticipation of fans as he is slowly building a name for himself as a composer.

CNBLUE is to comeback with the release of Re:Blue, which stands for rebirth of a new CNBLUE. The song, full music video and 4th mini-album is to be revealed on January 14.