The majority of these are stated in the story, but I wanted to clearly map it out, since a few people got confused when I put this up on DA.

Jobs/Majors:

Leeteuk: child doctor/ pediatrician
Heechul: pregnancy doctor/ OB/GYN
Hangeng: pediatric surgeon, translater and nurse
Kangin: police officer
Yesung and Kyuhyun: major in voice, minor in dance
Sungmin: major in piano, minor in voice (and takes guitar)
Ryeowook: major in music compostion, minor in voice
Donghae and Eunhyuk: major in dance
Zhou Mi: major in fashion design
Henry: major in music compositon, minor in dance
Siwon and Kibum: major in acting