Actor Lee Sun Gyun acts as a 'no guarantee' role in E2RE's music video.

Lee Sun Gyun will be featured in CS Happy Entertainment's rookie group E2RE's music video, "Deep Night, Sad Song."

Lee Sun Gyun, who is a big December fan, heard that group December's agency was coming out with a rookie group and agreed to act in the music video without pay.

The song, "Deep Night, Sad Song," is written by hit maker Jun Hye Sung and features a medium tempo ballad with emotional lyrics.

CS Happy Entertainment commented, "Lee Sun Gyun has decided to act with no pay and is all for stopping illegal downloading. You will be able to see his superb acting skills in this new music video."

E2RE will make their debut this November.