KPop Who Am I #14

Hi DKP fans, we are back with more challenging question!
See those photos below and guess who are they?

Number 1: 

Number 2: 

Number 3: 

Number 4:

Answers:

Number 1 is TOP (Big Bang)

Number 2 is Kim Hyun Joong (SS501)

Number 3 is Dong Ho (UKISS)

And number 4 is Dong Woo (Infinite)