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According to multiple sources, following his discharge today (29th), Leeteuk will join his fellow members to record their upcoming 7th album and preparations for their their world tour 'Super Show 6', which will kick off in Seoul on September 20-21. It's also been mentioned that he will also be participating in SMTOWN's concert in August ahead of Super Junior's comeback schedule.

As for Shindong, fans have been awaiting the confirmation of his enlistment date, and although no official word has come from SM, a few media outlets have reported that it is expected to be mid August. So if this is the case, then it's likely that he will not be able to join Leeteuk and the other members on stage for their tour and comeback. However, even if this is the case, ELF will still be able to listen to his voice on their upcoming 7th album. 

This is expected to be an on-going pattern for the group as fans know, since by the time that Yesung is discharged from military service in 2015, Super Junior's '86 line are expected to start enlisting. This means it will take quite a few more years before we can see the members perform all together.