There are some great tutorials out there so u won't b in too much trouble! There are a couple of different ways but the easiest will most likely be to build it out of furniture foam and liquid latex.
Kpop cosplay is life~
Cory- 24K U R So Cute **DEBUT**
PO- Block B Tell Them **DEBUT**
Baro- B1A4 Solo Day (Beach scene) **DEBUT**
POSSIBLE DEBUT: N-mi: VIXX Girls So Hot (VIXX So Hot cover)
CL- 2NE1 I am the Best