ap refers to Akanishi Jin and Yamashita Tomohisa
ak refers to Kamenashi Kazuya and Yamashita Tomohisa
The letters in the front are the attackers...so AK and KA The difference...
Original, you understand...
Official matching is official stuff. . .
Big relatives and friends... just good friends... best friends
SH... does it mean a hobby? ...guess it. . . .