So Ji-sub is 48, exhausted, and suddenly leading Korea's biggest miniseries of 2026

Episode three of Agent Kim Reactivated averaged 18.8 percent nationwide on July 3, per Nielsen Korea, making it the most-watched program of any kind on Friday broadcast TV and the highest-rated Korean miniseries of 2026 so far. That is three episodes. Most revenge dramas need a mid-season twist before casual viewers even know the title.

The number lands in a month already crowded with Netflix school-action hit Teach You a Lesson and a crowded field of Korean originals fighting for the same group chats. Agent Kim is playing a different game: SBS airs two episodes every Friday and Saturday while Netflix drops the same pair weekly for international viewers, so domestic ratings and global view counts feed each other instead of spoiling one audience for the other.

So Ji-sub plays Kim Do-hyeon, a retired North-South covert agent living as an ordinary father until his daughter disappears. The hook is webtoon-familiar, but the performance is not nostalgia cosplay. So is 48, and the show treats exhaustion as action grammar: controlled movement, grief that comes out as focus, a lead old enough to have adult stakes in the plot without the script winking at his age.

If you have been tracking July through Netflix charts alone, Agent Kim debuted at No. 3 on the global non-English top 10 with about 6.6 million views the same week Teach You a Lesson held No. 1. Our So Ji-sub profile maps why Mercy for None and this father-revenge lane were the deliberate late-career bet, not a surprise pivot. The open question now is whether 18 percent holds once summer festival travel pulls eyeballs away, or whether Korea just proved a father-revenge drama led by a man in his late forties can still dominate prime time the same way twenty-something romance used to.