Yeo Woon (Yoo Seung Ho) in Warrior Baek Dong Soo :'(
Nobody thought Dong Ha from Suspicious Partner was really great? I was mesmerized.
.
I second SWDBS The guy from Strong Woman was pretty creepy. Good acting, though. 
Lee Sung Jae from Gu Family Book  (tough to be for pure evil)
Mishil (Go Hyunjung) from Queen Seon Deok
Chae Do Woo (Kim Kang Woo) from A Man's Story
YooJin (Song Yoona) from The K2
Taejoon (Yoo Jitae) from The Good Wife
Kim Bonggoo (Yoon Jemoon) from King 2 Heart
Shunji (park kiwoong) from Bridal Mask
Minjung (Lee Yuri) from jang bori is here
Dad/Killer (Kim Uinsung) from W: 2 worlds
Sung Hoon (Yang sejong) from Duel
Gwi (Lee Soo Hyuk) from Scholar Who Walks the Night
Taejoon (Jo JaeHyun) from Punch
Kwon Jae-hee (Nam Goong Min) from The Girl Who Sees Smells
jin pyo (Kim snagjoong) from city hunter
Seokhoon (yoon junghoon) from Mask
sooyoung (Joo soohyang) from school 2015: who are you
Park Bok Ja - Woman of Dignity
Jae Hyun - Manhole

they actually made me want to watch the drama because of them :D

Mo Tae Goo from Voice (Kim Jae Wook was really brilliant in this), one of my fav villains ever

 RoyalMajesty:

For Me:

Kwon Jae-hee (played by Nam Gung Min) from The Girl Who Sees Smells

Nam Gyu-man (played by Nam Gung Min) from Remember: War of the Son

Ditto, plus I'd add the character Cha Min Ho from The Defendant played by Uhm Ki Joon

Cho Gab Soo from Witch's Court

Spiritual Father from Save Me

the evil twin in Defendant (got the names mixed up xD)

Nam Gyu Man from Remember: War of the Son 

The villain in Suspecious partner .

 

  1. Cha Moon Sook (Lawless Lawyer)- I LOVE a smart villain and the way she manipulated Bong Sang Pil, the ML, had me rooting for her
  2. Yoon Hui Jae (Come and Hug Me)- straight crazy but wonderfully acted
  3. Oh Jae Uk (The Five)- another smart villain steps ahead of the protagonist

and a special shout out to Lee Joon- he seems to always be playing the bad guy/ creep in whatever I watch with him

Do Ha's Jung Hyun Soo from Suspicious Partner (the only thing that kept me from leaving this drama behind) and Jo Jae Yoon's Jo Wan Tae from Save Me.

Yeon Minjung (Lee Yoori) - Jang Bori is Here
When watching this I thought that this girl will win Daesang, and she really won it :D

Come and hug me-Yoon Hui Jae (ugh,this dude gave me chills since the beginning )

Hello Monster -Jung Seon Ho (i think he's the cutest villain out of all the dramas i've watched and i actually loved him in the end)

Strong Woman Do Bong Soon - Jang Mi Kwan (everything about him was just plain creepy)

Lady Mishil from Queen Seondeok

Court Lady Choi from Dae Jang Geum