While Pentagon's introductory phrase, in which the boys shout "Pentastic! Hello, we are Pentagon!", was created during the group's pre-debut reality show 'Pentagon Maker' and voted on as the one desired by fans, it's been pointed out on online communities that the term "pentastic" is too similar to an official F.T. Island fan item called the "Pentastick". The "Pentastick" is an essential item for many Primadonna, who wave it around during F.T. Island performances.

Cube Entertainment stated about the issue, "While Pentagon's current introduction, which fans helped Pentagon create through Mnet's 'Pentagon maker', is a precious introduction which represents Pentagon, we have decided to change it to a more meaningful introduction by combining the number 10, which symbolizes Pentagon, with the word fantastic, to make (Tentastic). Please cheer on and support Pentagon, who will begin their official promotions through 'M! Countdown' this October 13."�

It seems like the group was able to deal with the situation with a simple, minor change to their introduction without altering its meaning too much. Do you like Pentagon's new introduction?�