# A Bona Fide Killer drama tops Korean ratings

> Live situation record from CLSTR: https://clstr.news/situations/a-bona-fide-killer-drama-launch-in-south-korea
> Updated: 2026-08-21T02:23:57.000Z. Sources: 9. Developments: 5.

The series premiered on MBC on July 31, 2026, starring Gong Hyo-jin, Jung Joon-won, and Lee Sang-yi. The debut marked Gong Hyo-jin’s return to MBC after a 15-year hiatus. Within hours, it recorded a 7.4% average nationwide rating, placing it first in its time slot and overtaking the slot left by the recently concluded drama “Agent Kim Reactivated”. A companion special program, “Chief Kim The Universe”, aired in the same slot, achieving a 4.5% rating.

Adapted from a Kakao webtoon and written by Kim Eun-hee, the drama follows assassin Yoo Bo-na (“Kingfisher”) who conceals her lethal identity from her husband, investigative journalist Kwon Tae-seong, while balancing family life. The series is directed by Yoon Jong-ho and Kim Ji Hoon.

By its sixth episode, the drama reached a significant viewership milestone, recording an average rating of 10.2% during its August 15, 2026, broadcast. This surge made the series the most-watched miniseries in South Korea for Saturday nights, outperforming competitors such as KBS’s “Love on the Menu” and SBS’s “Flex x Cop 2”.

Recent episodes have begun revealing key backstory elements regarding the relationship between the protagonists. Flashbacks depict their first encounter eight years prior during the World Cup, where Yoo Bo-na, acting as a secret sniper, discovered Kwon Tae-seong after he was attacked while investigating pickpockets. Plot developments also include a sequence involving a search for a missing Yoo Bo-na on a snowy mountain and upcoming explorations into the motivations of Lee Dong-jin regarding his police career.

## Timeline

### 2026-08-21: A Bona Fide Killer reveals backstory of main characters

New episodes of the MBC drama “A Bona Fide Killer” reveal the backstory of Yu Bo-na and Kwon Tae-sung, detailing their first encounter during the World Cup eight years prior.

2 sources. https://clstr.news/cluster/a-bona-fide-killer-reveals-backstory-of-main-characters

### 2026-08-15: A Bona Fide Killer reaches double-digit ratings in South Korea

The MBC drama ‘A Bona Fide Killer,’ starring Gong Hyo-jin, reached a peak rating of 10.2 percent in its sixth episode, becoming the most-watched Saturday night miniseries in South Korea.

2 sources. https://clstr.news/cluster/a-bona-fide-killer-reaches-double-digit-ratings-in-south-korea

### 2026-08-05: A Bona Fide Killer tops Korean TV ratings, replacing Agent Kim Reactivated

MBC’s “A Bona Fide Killer” debuted with a 7.4% rating, topping Korean TV and succeeding “Agent Kim Reactivated”; a related special earned 4.5%.

2 sources. https://clstr.news/cluster/a-bona-fide-killer-tops-korean-tv-ratings-replacing-agent-kim-reactivated

### 2026-08-01: A Bona Fide Killer drama premieres on MBC, new episodes slated for early August 2026

The Korean drama A Bona Fide Killer premiered July 31 2026 on MBC; episodes 1‑2 aired immediately and episodes 3‑4 are set for Aug 7‑8, following assassin Yoo Bo‑na (Kingfisher) and her journalist husband.

4 sources. https://clstr.news/cluster/a-bona-fide-killer-drama-premieres-on-mbc-new-episodes-slated-for-early-august-2026

### 2026-08-01: Gong Hyo Jin's comeback drama 'A Bona Fide Killer' tops Korean TV ratings

Gong Hyo Jin’s drama A Bona Fide Killer debuted with a 7.4 % rating, leading its time slot and marking her MBC return after 15 years.

2 sources. https://clstr.news/cluster/gong-hyo-jins-comeback-drama-a-bona-fide-killer-tops-korean-tv-ratings

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Cite as: A Bona Fide Killer drama tops Korean ratings. CLSTR, https://clstr.news/situations/a-bona-fide-killer-drama-launch-in-south-korea