‘Agent Kim Reactivated’ Character Guide: Who’s Really Behind Every Mask in SBS’s Breakout Spy Thriller

‘Agent Kim Reactivated‘ has turned into one of the summer’s biggest Korean drama success stories, and a big part of that comes down to its tightly wound cast of former operatives, secret allies, and genuinely nasty villains. The show wrapped its ten episode run on July 25, and it closed things out the way it started, as the most watched program of its entire broadcast week.

Between the workplace comedy of Manager Kim’s cover life and the brutal action sequences tied to his past, ‘Agent Kim Reactivated’ has built a surprisingly deep bench of characters worth breaking down. Here is a full guide to who everyone is in the SBS hit, and what role they play in Kim’s mission to save his daughter.

Manager Kim and the Reactivated Agent at the Center

So Ji-sub leads the series as Kim Do-hyeon, known to his coworkers simply as Manager Kim, a seemingly unremarkable employee at a small savings bank raising his teenage daughter alone. Underneath that identity is a former secret intelligence operative who once worked covert missions between North and South Korea, a past he has kept hidden even from his own family. When his daughter Min-ji goes missing, Manager Kim is forced to shed his ordinary life and reactivate the skills that made him one of the most dangerous agents on either side of the border.

That daughter, Kim Min-ji, is played by Seo Su-min in her debut role. Min-ji is introduced as a rebellious teenager who refuses to apologize even after standing up to bullies at school, and her sudden disappearance is what sets the entire plot into motion. Reviewers have singled out Seo Su-min’s performance, with one write-up calling her school struggles a source of heavy, grounded stakes that makes the larger action plot feel more urgent.

The character has been widely compared to Bryan Mills from ‘Taken’, a comparison that critics have called fair but limited, since the show spends just as much time examining what the mission costs Manager Kim as it does the rescue itself.

Meet the Agent Dads Backing Up Manager Kim

Manager Kim does not carry the mission alone. Choi Dae-hoon plays Seong Han-su, a former covert operator who crosses paths with Kim during his search and becomes one of his closest allies throughout the series.

Yoon Kyung-ho rounds out the trio as Park Jin-cheol, a former elite combat veteran once nicknamed a god of war, who is now raising his own daughter, Da-bin. Jin-cheol has been described as the show’s comedic yet serious wild card, and Yoon has said he saw the character’s fighting style as sitting somewhere between Kim’s cold precision and Han-su’s flashier showmanship.

Together, this trio has become the emotional backbone of ‘Agent Kim Reactivated’. One review described their dynamic as the drama’s magical trio, praising their effortless chemistry as they trade jokes while taking down enemies in the same breath. Their shared identity as agent dads, each hiding a dangerous past while raising a daughter, gives the show its recurring theme of fatherhood colliding with old, violent lives.

Jung Sang-a and the Special Missions Directorate

Son Na-eun plays Jung Sang-a, a colleague of Manager Kim’s at the bank who is introduced as ordinary before revealing a hidden agenda of her own. Sang-a is tied to the Special Missions Directorate, the agency that both monitors and eventually pulls Manager Kim back into active operations as the series escalates.

Her exact allegiances shift throughout the season, and multiple recaps note that her role in the larger conspiracy stays deliberately unclear for much of the run. What is confirmed is that Sang-a becomes a key figure in helping Min-ji during the moments when she is separated from her father, stepping in during dangerous situations as the special agent assigned to the case.

Kim Sung-kyu also factors into this side of the story as Park Gang-seong, identified as a North Korean secret agent connected to Kim’s past missions. His presence reinforces the show’s central conceit, that Manager Kim’s history on North Korea’s blacklist is never fully behind him no matter how ordinary his cover life appears.

Ju Gang-chan and the Villains Hunting Kim’s Family

Joo Sang-wook anchors the antagonist side of ‘Agent Kim Reactivated’ as Ju Gang-chan, the chairman of Juhak Construction and the central villain of the season. Gang-chan is described as someone who treats wealth and violence as interchangeable tools, the type of antagonist who never needs to get his own hands dirty because of the world he has built around himself.

Supporting Gang-chan’s operation is Lee Dong-ha as Director Nam, described as his right-hand man, along with Jo Bok-rae as a menacing service company representative nicknamed Golden Teeth. Lee Jae-yong plays Ri Eung-ryeong, identified as a North Korean army lieutenant, whose fate became a major talking point among fans following the show’s penultimate episode.

Won Hyun-joon rounds out the antagonist roster as Kang Guk-cheol, also known by the code name Mole Cricket, another South Korean secret agent whose loyalties complicate the back half of the season. As Manager Kim’s mission unravels across the finale, this web of villains is what pushes him, Han-su, and Jin-cheol into their most dangerous confrontation yet.

Now that ‘Agent Kim Reactivated’ has wrapped its first season on a No. 1 ratings note, which member of Manager Kim’s makeshift family of agent dads do you think deserves their own spinoff mission next?