DJ DOC's�Kim Chang Ryul's idol group,�Wonder Boyz, has debuted with their mini-album 'Open the Door'.

The album contains five tracks including the title track "Open the Door" as well as "Clap Music", "It's Exciting", "Sorrow Part 2", and "All About You".

As mentioned previously, the boys hope to leave a mark on the music industry as a group who will be able to energize the audience and bring some excitement to the public, and it seems their debut album is out to do just that.

Check out the Wonder Boyz' performance on 'M! Countdown' below!