Agent Kim Reactivated Just Broke a 5-Year K-Drama Ratings Record — So Ji Sub's Comeback Is Legendary

Agent Kim Reactivated Is the Biggest K-Drama of 2026 — And It's Not Even Close

K-drama fans, mark this moment: Agent Kim Reactivated has just shattered a five-year ratings record on SBS, pulling in an average nationwide rating of 15.7% according to Nielsen Korea. That makes it the highest-rated Korean drama since The Penthouse dominated screens back in 2021. And the man at the center of it all? The one and only So Ji Sub.

For those who've followed So Ji Sub's career — from I'm Sorry, I Love You to My Secret Terrius — this comeback feels like a coronation. After a relatively quiet period following his marriage in 2020, the actor has returned with a performance that critics are calling the best of his career.

What's Agent Kim Reactivated About?

The series follows Kim Hyun-woo (So Ji Sub), a retired NIS agent living a mundane life as a high school security guard. When a former colleague goes missing and a classified operation from his past resurfaces, Kim is reluctantly pulled back into the world of espionage. Think Jason Bourne meets Reply 1988 — equal parts adrenaline and heart.

Co-starring Han Hyo Joo as a tenacious journalist investigating the same conspiracy and Lee Dong Wook as Kim's morally ambiguous former handler, the cast is stacked. Director Yoo In Sik (who gave us Mr. Sunshine) brings a cinematic quality that feels more like a feature film than a weekly drama.

Why It's Resonating With Audiences

Part of the show's magic is its pacing. Unlike many K-dramas that front-load action and lose steam midway, Agent Kim Reactivated has maintained a steadily climbing viewership. Episode 2 hit 15.7%, episode 4 climbed to 17.2%, and the most recent episode reportedly cracked 19%. At this rate, a 20%+ finale isn't just possible — it's expected.

International fans aren't being left out either. The show is available on Viki and Kocowa, where it's consistently ranked in the top 3. On social media, clips of So Ji Sub's fight choreography have gone viral, with one hallway sequence amassing over 40 million views on TikTok.

The K-Drama Renaissance Continues

Coming off the heels of hits like Our Sticky Love (starring Jung Hae In) and My Bias, My Boss (featuring Kang Hoon), 2026 is shaping up to be one of the strongest years for Korean television. With Dive Into You also premiering this week and The Remarried Empress generating Disney+ buzz, the K-drama pipeline shows no signs of slowing down.

If you're sleeping on Agent Kim Reactivated, consider this your wake-up call. So Ji Sub didn't come back to play — he came back to dominate.