Boyfriend's teaser pictures! All six members are out!

Youngmin and Kwangmin was first on January 3, 2013:

Next was Hyunseong and Donghyun on January 5, 2013:

The last members', Minwoo and Jeongmin, pictures were released today, January 5, 2013:

That's all for now! I'll update this chapter if more appears!

EDIT: 

Released on January 6, 2013, Kim So Hyun will be the female lead in Boyfriend's latest MV, <I YAH>  (Source)