I think they are allowed to have relationship. Yoona and Sooyoung are even dating.
No
Girls' Generation was created in 2007.
Kim Tae Yeon is the leader in Girls' Generation.
Girls' Generation debuted on August 5, 2007
Girls' Generation-TTS was created in 2012.
Girls Generation's sub-group is Taetiseo (TTS)
Seohyun is the Maknae of Girls Generation. She's 20.
Gee - Girls' Generation song - was created in 2008.
The duration of Girls' Generation's Hello Baby is 2400.0 seconds.
there is a k pop group called girls generation that is all girls, but I have never heard of generation g.
Girls' Generation's Hello Baby ended on 2009-11-17.
Girls' Generation's Hello Baby was created on 2009-06-23.