Consonants:

ㄱ

It is pronounced as Giyeok.

As in Geek.

It is the first consonant in Hangul.

Idols that begin with ㄱ:

기광 (Gikwang)

가인 (Ga In)

공찬 (Gongchan)

길미 (Gilme)

가희 (Gahi)

ㄴ

It is pronounced Nieun.

As in Nile.

It is the second consonant in Hangul

Idols that start with ㄴ:

니엘 (Niel)

나은 (Naeun)

노을 (Noeul)

나나 (Nana)

니콜 (Nicole)

나르사 (Narsha)

ㄷ

It is pronounced Digeut

As in Dog

It is the third consonant in Hangul

Idols that begin in ㄷ:

다니엘(Daniel)

대성 (Daesung)

동해 (Donghae)

동준 (Dongjun)

다라(Dara)

다리 (Dari)

ㄹ

It is pronounced Rieul

As is reaL , saRanghae

It can be spoken as an L/R. That's why it's difficult for Koreans to pronounce some English

It is the fourth consonant in Hangul.

Idols that begin with ㄹ:

라비 (Ravi)

레인 (Rain)

라니야 (Rania)

레 (Lay)

루한 (Luhan)

ㅁ

It is pronounced Mieum

As in Medium.

It is the fifth consonant in Hangul

Idols that begin with ㅁ:

마루 (Maru)

민우 (Minwoo)

민지 (Minzy/Minji)

민호 (Minho)

ㅂ

It is pronounced Bieup

As in Big

It is the sixth consonant in Hangul

It may resemble a slight 'p' sound. 

ex: 

Yoseb can be spelled 

Yoseob or Yoseop

Kiseop can be spelled 

Kiseob or Kiseop

It may also resemble a 'V'

Ex:

Ravi is spelled 라비 

Hello Venus is spelled 헬로 비너스

But when it is written in Korean, it uses the consonant ㅂ

Idols that begin with ㅂ:

바로 (Baro)

보라 (Bora)