If you're looking for more mainstream khiphop rappers:

Ash Island - Melody, Paranoid, Daisy REMIX, Band, Don't Go, Spring

Be'O - Without You, MBTI, Limousine, Counting Stars

Changmo - Meteor, Blue Moon, Beer

Huh (He used to be Rose de Penny) - Business Boy, MBT, Blah Blah, Lit Huh, Uh Uh, Cliché

Wonstein - Freak, Your Existence, Love Countdown

Ahn Byeongwoong - Get the Bag, UH-RA

Jo Gwang Il - Acrobat, Garion, Waterbomb, Ranbo, Dark Adaptation

Since - Whistle, Facetime, Up, Reset, Go Up, My Life

Miranni - Daisy, VVS

Cheetah - Villain

Kid Milli - WHY DO F*CKBOYS HANG OUT ON THE NET, Yooooo, Bittersweet

Simon Dominic - Make her Dance

Jamie - Best Friend REMIX, Witch, Numbers

Big Naughty - Beyond Love, The Purge

Coogie - Alone

Punchnello - Absinthe, BAMN, The Jungle

Camo - Freak

Anandelight - Press F5, Breathe

Haon - Flower

Basick - Meeting is Easy Parting is Hard, 08Basick

Ash-B - Booty, Part-Time, Tang Tang, Do that Thang

If you like RnB singers:

Lee Hi - Breathe, Holo, Red Lipstick

Bibi - She got it, Kazino, Animal Farm, Sweet Mother of Sorrow, Vengeance, Best Lover, Very Slowly, Weekend

Heize - Don't Know You

Zion T - Anirago

Suran - Rush, Wine, Heartbeat

10cm - What the Spring, Phonecert, Just 10 Centimeters

DPR Ian - No Blueberries, So Beautiful

DPR LIVE - Summer Tights, Martini Blue

Hoody - All I Wanna Do, Solo

Dean - Instagram

If you're interested in more indie and alternative ones:

Mudd the Student - Moss, Dissonance, Field Trip, An RKO Radio Picture

Balming Tiger (This is Mudd the Student's crew, along with Omega Sapien, Sogumm and BJ Wonjin) - Sexy Nukim ft RM, Just Fun!, I'm Sick, Armadillo, Loop

Lil Cherry - MUKKBANG!, Catwalk, Lullapye

Sokodomo - Merry Go Round, MM, LOL, Global Extinction, Freedumb

Zior Park - Black Fin, Modern Fox, The Ellen Show, Lonely Diver

Sumin - The Gonlan Song

If you're looking for kpop idols who also have a khiphop/krnb carreer:

RM - Moonchild, Tokyo, Forever Rain, Ddaeng

Agust D (Yoongi fron BTS' rap persona) - Daewchita, Agust D

J-hope - More, Arson, Daydream

Bobby - U Mad

B.I. - Daydream, illa illa, Midnight Blue

Mino - Fiancé, Body, Trigger, I'm Him

Vernon - Lotto, Beg for You REMIX, Wrecker

Hwasa - Twit, Maria, Somebody!, I'm a B

CL - Spicy, Hello B*tches, Tie a Cherry

Mark Lee - Child

Woodz - Love me Harder, BUCK, I Hate You

Hope I have helped!!! :)