allkpop previously reported that Super Junior would be releasing "Mr. Simple" as their second Japanese single. It has just been confirmed that the boys will release the single on December 7th (Digital Single on October 19th), and they've also melted the hearts of ELFS by revealing a teaser video! Furthermore, three different versions of the single will be unleashed, including: limited edition with CD + DVD, regular edition with CD + DVD, and lastly CD + DVD only. All three will come with both, the Korean and Japanese version of "Mr. Simple", as well as another song yet to be announced. The limited version's DVD will contain four different versions of the "Mr. Simple" music video, as well as the behind-the-scenes clip. A randomly selected photo card, out of the possible 10, will also be packaged with the limited edition, as well as the CD + DVD version. Be sure to check out the shortened preview below! Source: Super Junior Japan + 2