As of December 29th, here are the 9 highest IMDB user ratings (with over a hundred votes) of Korean dramas which were released or aired from November to December 2021:
8.9/10: Bad And Crazy

No. of IMDB votes: 260
Synopsis: A mystery drama in which detectives with different personalities solve various cases.
Genre: Drama, Thriller, Mystery, Fantasy
No. of episodes: 12
Starring: Lee Dong-wook, Wi Ha-joon, Han Ji-eun and Cha Hak-yeon
Written by: Kim Sae-bom
Directed by: Yoo Seon-dong
Date: December 17, 2021 – present
Network: TVN, iQIY, TVING
8.8/10: Snowdrop

No. of IMDb votes: 2,700
Synopsis: Adapted from the handwritten notes of a man who escaped from a political prison camp in North Korea, Snowdrop is set against the backdrop of the 1987 Democracy Movement in South Korea.
Genre: Black comedy, Romance, Melodrama, Period
No. of episodes: 16
Starring: Jung Hae-in, Jisoo, Yoo In-na, Jang Seung-jo, Yoon Se-ah, Kim Hye-yoon, Jung Yoo-jin
Written by: Yoo Hyun-mi
Directed by: Jo Hyun-tak
Date: December 18, 2021 to present
Network: JTBC, Disney+
8.8/10: The Red Sleeve

No. of IMDB votes: 409
Synopsis: It tells the record of a royal court romance between the King of Joseon who believes his duty is to his country first above love, and a court lady who wants to protect the life she has chosen.
Based on: The Red Sleeve Cuff by Kang Mi-kang
Genre: Romance, Historical drama
No. of episodes: 17
Starring: Lee Jun-ho, Lee Se-young, and Kang Hoon
Written by: Jung Hae-ri
Directed by: Jung Ji-in and Song Yeon-hwa
Date: November 12, 2021 – present
Network: MBC, Viu
8.7/10: Our Beloved Summer

No. of IMDB votes: 434
Synopsis: Years after filming a viral documentary in high school, two former lovers get pulled back in front of the camera and into each other’s lives.
Genre: Romance, Comedy, Drama
No. of episodes: 16
Starring: Choi Woo-shik, Kim Da-mi, Kim Sung-cheol, Roh Jeong-eui
Written by: Lee Na-eun
Directed by: Kim Yoon-jin
Date: December 6, 2021 – present
Network: SBS, Netflix
8.6/10: One Ordinary Day

No. of IMDB votes: 840
Synopsis: A remake of the BBC drama “Criminal Justice” that delves into the criminal justice system through the story of two men surrounding a woman’s murder.
Based on: Criminal Justice by Peter Moffat
Genre: Crime, Thriller, Legal
No. of episodes: 8
Starring: Kim Soo-hyun, Cha Seung-won, and Kim Sung-kyuo
Written by: Kwon Soon-kyu
Directed by: Lee Myung-woo
Date: November 27 – December 19, 2021
Network: Coupang Play and Viu
8.4/10: Happiness

No. of IMDB votes: 1,900
Synopsis: An apocalyptic thriller that takes place in a time in which infectious diseases have become the new norm.
Genre: Drama, Horror, Thriller, Action fiction, Fantasy television
No. of episodes: 12
Starring: Han Hyo-joo, Park Hyung-sik, and Jo Woo-jin
Written by: Han Sang-woon
Directed by: Ahn Gil-ho
Date: November 5 – December 11, 2021
Network: TVN, Viu, and iQIY
8.1/10: Work Later, Drink Now

No. of IMDB votes: 106
Synopsis: The story of three women whose belief in life is one drink at the end of the day.
Based on: the Kakao webtoon Drinker City Women by Mikkang
Genre: Comedy, Slice of life
No. of episodes: 12
Starring: Lee Sun-bin, Han Sun-hwa, Jeong Eun-ji, and Choi Si-won
Written by: Wi So-young
Directed by: Kim Jung-sik
Date: October 22 to November 26, 2021
Network: TVING
8/10: The King’s Affection

No. of IMDB votes: 1,200
Synopsis: During the Joseon Dynasty, the Crown Princess Consort gives birth to twins but sends the girl away to spare her life. Years later, the twin son dies in an accident and his sister must assume his identity and throne, all while hiding her true self.
Based on: Yeonmo by Lee So-young
Genre: Romantic-comedy, Fiction, Sageuk
No. of episodes: 20
Starring: Park Eun-bin, Rowoon, Nam Yoon-su, Choi Byung-chan, Bae Yoon-kyung, and Jung Chae-yeon
Written by: Han Hee-jung
Directed by: Song Hyun-wook
Date: October 11 – December 14, 2021
Network: KBS2 and Netflix
8/10: Secret Royal Inspector & Joy

No. of IMDB votes: 194
Synopsis: Set in Joseon dynasty, it tells the story of a young gourmet who unintentionally becomes a royal inspector and a divorced woman who rushes to find happiness, as they team up to investigate and expose corrupt politicians.
Genre: Historical drama, Comedy
No. of episodes: 16
Starring: Ok Taec-yeon and Kim Hye-yoon
Written by: Lee Jae-yoon
Directed by: Yoo Jong-seon
Date: November 8, 2021 – present
Network: TVN, iQIYI, Viu