Now from their MONTH of birth:

Teuk:07...0+7=7

Heechul:07...0+7=7

Hankyung:02...0+2=2

Yesung:08...0+8=8

Kangin:01...0+1=1

Shindong:09...0+9=9

Sungmin:01...0+1=1

Eunhyuk:04...0+4=4

Donghae:10...1+0=1

Siwon:02...0+2=2

Ryeowook:06...0+6=6

Kibum:08...0+8=8

Kyunhyun:02...0+2=2

Same Way Of Adding

7+7+2+8+1+9+1+4+1+2+6+8+2=58

5+8=13