On the June 9 airing of 'Cultwo,' Double S 301 mentioned the other SS501 members who are in the army, particularly Park Jung Min. 

Kim Kyu Jong said, "Because the other two members are in the army, we don't get to see them often. Park Jung Min told us to take our time releasing a new album. It's because he hasn't yet memorized our previous album." 

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Kim Kyu Jong went on to joke, "So we actually release an album faster." Poor Park Jung Min now has two albums to memorize when he returns from the army...