[cr: 내꺼해 @ SJ-Market]
SuJu 11th Floor = Kyuhyun Sungmin Yesung Eunhyuk
because they all lived on the 11th floor XD and they had a battle with 12th floor (HaeTeukRyeoDong)
IYah is originally by . and was one of the best hit of them!
Yesung is so funny, he ran out of breathe at the end singing so everybody laughed so hard XD