Updated: January 31, 2023
Here are the most watched TV series in South Korea in January 2023: TV ratings are based on nationwide viewership data from Nielsen Korea.
| Nationwide Rating | Title | Network | Cast / Creators |
| 26.3% | Three Bold Siblings (2022-2023) | KBS2 | Starring: Lee Hana, Lim Ju-hwan, Wang Bit-na, Kim So-eun, Lee Tae-sung Writer: Kim In-yeong Director: Park Man-yeong |
| 19.0% | The Love In Your Eyes (2022-2023) | KBS1 | Starring: Baek Sung-Hyun, Bae Noo-ri, Choi Yoon-ra, Jung Su-hwan Writer: Na Seung-hyun Director: Ko Young-tak |
| 15.2% | Vengeance Of The Bride (2022-2023) | KBS2 | Starring: Park Hana, Kang Ji-seub, Park Yoon-Jae, Oh Seung-ah Writer: Song Jeong-rim Director: Park Ki-hyun |
| 11.9% | Agency (2023) | JTBC | Cast: Lee Bo-young, Jo Sung-ha, Son Na-eun, Han Joon-woo, Jeon Hye-jin Writer: Song Soo-han Director: Lee Chang-min |
| 11.1% | Payback (2023) | SBS | Starring: Lee Sun-kyun, Moon Chae-won, Kang Yoo-seok, Park Hoon Written by: Kim Won-seok Directed by: Lee Won-tae |
| 10.9% | Crash Course In Romance (2023) | tvN | Starring: Jeon Do-yeon, Jung Kyung-ho Writer: Yang Hee-seung Director: Yoo Jae-won |
| 9.6% | Alchemy Of Souls Part 2 (2022-2023) | tvN | Starring: Lee Jae-wook, Go Yoon-jung, Hwang Min-hyun, Arin, Yoo In-soo Writers: Hong Jung-eun and Hong Mi-ran Director: Kim Seong-yoon |
| 7.9% | Red Balloon (2022-2023) | TV Chosun | Starring: Seo Ji-hye, Lee Sung-jae, Hong Soo-hyun, Lee Sang-woo, Lee Bo-hee Writer: Moon Yeong-nam Director: Jin Hyeong-wook |
| 7.3% | Game Of Witches (2022-2023) | MBC | Starring: Jang Seo-hee, Oh Chang-seok, Kim Kyu-seon, Han Ji-wan, Lee Jung-gil, Yoon Mi-ra Writer: Lee Do-hyeon Director: Lee Hyeong-seon |
Source: Nielsen Korea
KORB 