So Ji-sub's 'Agent Kim Reactivated' Just Became 2026's Highest-Rated K-Drama on Netflix — Here's Why Everyone's Hooked

So Ji-sub Is Back, and He's Breaking Records

If you thought K-drama couldn't get any bigger in 2026, think again. SBS action thriller Agent Kim Reactivated, starring the legendary So Ji-sub, has just become the highest-rated miniseries of the year after only three episodes. We're talking a massive 18.8% nationwide rating — a number that would make even Squid Game creators do a double take.

The show, which streams internationally on Netflix, follows a former intelligence agent pulled back into the field for one last mission that spirals into something far more personal. So Ji-sub plays the titular Agent Kim with that signature brooding intensity he brought to Master's Sun and My Secret Terrius, but with a grittier, more physical edge that fans have been craving.

Why the Ratings Are Through the Roof

Three episodes in, and Agent Kim Reactivated is already outperforming heavy hitters like The East Palace and Love in Sync in the same time slot. The chemistry between So Ji-sub and his co-star — whose identity the production kept under wraps until episode 2 — has been a major talking point on social media. The action choreography, overseen by the same team behind The Gangster, the Cop, the Devil, delivers some of the most visceral fight scenes on Korean television this year.

But it's not just action for action's sake. The writing team, led by Park Hoon-jung (New World, Night in Paradise), weaves a layered narrative about loyalty, betrayal, and the cost of serving a system that discards you. Episode 3's twist — which we won't spoil here — has already spawned hundreds of theory threads on Reddit.

What's Next for Agent Kim

With 12 episodes total, Agent Kim Reactivated is positioned as a limited series, meaning there's no guarantee of a Season 2. But given these numbers, industry insiders are already speculating about a potential spinoff. Netflix, which co-produced the series with SBS, is reportedly very happy with the international streaming performance, particularly in Southeast Asia and Latin America.

If you haven't started yet, you're already late to the party. Three episodes are streaming now on Netflix, with new episodes dropping weekly. Trust us — you want to be caught up before episode 4 airs, because the internet will not be kind to spoilers on this one.