Leessang and YB will be releasing a new song titled "Mad Man" for their joint concert.

According to Leessang Company, "They song was originally meant for only the concert but they recorded the song because fans have give so much support for their concert. It's a song full of energy and asks the fans to have some crazy fun with them." The two bands have already collaborated through "Run" and "Someday", and will show off the same powerful sound in "Mad Man".

"Mad Man" will be released on December 4th.