So Ji-sub's 'I'm Sorry, I Love You': The secret behind 'Agent Kim Reactivated' iconic scenes
Actor So Ji-sub shares behind-the-scenes stories of intense action and emotional moments from the SBS Special 'Agent Kim Reactivated the Universe'.
Actor So Ji-sub gave an unexpected confession to Joo Sang-wook: "I'm sorry, I love you."

While the phrase is familiar, this time it was a joke made on an action set rather than a melodrama set. However, that short sentence captured the full weight of the actors' dedication and their affection for the project as they threw themselves into every scene.
In the second part of the SBS Special program 'Agent Kim Reactivated the Universe,' which aired on August 1, hidden character stories and behind-the-scenes footage not captured in the main series were revealed. In particular, the stories behind the intense action sequences shared by So Ji-sub and Joo Sang-wook drew significant interest from viewers.
During the broadcast, Joo Sang-wook recalled the confrontation between Agent Kim (So Ji-sub) and Joo Kang-chan, saying, "I will never forget that day for the rest of my life." To this, So Ji-sub joked, "I hit him a lot. He deserved it, so he had to be hit," drawing laughter from the set.
However, behind the laughter lay a grueling filming process. Joo Sang-wook confessed his hardships, saying, "I thought I was taking the hits well. But no matter how many times we filmed, I hadn't even been hit half as much as I thought. I wondered how many more times I had to be hit just to complete one full lap of the set."
In response, So Ji-sub made the set burst into laughter by telling Joo, "He said he had never been hit in action that much before," followed by, "I'm sorry, I love you."
While it sounds like a simple joke, the moment showcased the core direction of the action in 'Agent Kim Reactivated.' It was not action meant to merely flaunt violence, but action born from the collision of emotions and narratives between characters. More important than the physical struggle was the persuasiveness of *why* they were fighting, and the actors expressed those emotions through their movements.
- "We met again covered in blood"... Action scenes that surprised even the actors
Actors Choi Dae-hoon and Yoon Kyung-ho also shared the atmosphere of the set.
The two revealed, "We told each other we should greet each other warmly when we saw each other again after the script reading, but the next time we actually saw him was that day. We greeted him while being covered in blood," which brought laughter to the studio.
In particular, the anecdote where Joo Sang-wook remarked, "I didn't know this was the kind of drama it was," highlights the intense stylistic identity of 'Agent Kim Reactivated.'
However, great scenes are not made through action alone. PD Lee Seung-young highly praised the actors' immersion and ad-libbing skills.
He complimented them, saying, "Their ad-libs filled the gaps while staying true to the intended direction. They are actors who perform ad-libs on a different level."
He evaluated So Ji-sub by saying, "He has a natural feel for action. Even when he moves slowly, he is stylish and learns quickly," while describing Choi Dae-hoon as an "extremely hardworking actor."
- "Let's not mess with the man in glasses"... The most realistic message in 'Agent Kim Reactivated'
Yoon Kyung-ho revealed the hidden meaning behind the fight scene between Nam Sil-jang and Park Jin-cheol.
The ad-lib he suggested was the line, "Let's not mess with the man in glasses."
Yoon explained, "In the first meat restaurant scene, the words we were trying to hold back were, 'We're just a man in glasses.' I felt those words contained a lot of imagery."
He continued, "I wanted to convey the sense of liberation that even though someone looks ordinary on the outside, they are someone who should never be underestimated. The director liked it, and it became a line that pierces through the entire drama."
This demonstrates that 'Agent Kim Reactivated' is not just a simple revenge story or action piece, but a work that tells the story of the inner strength possessed by ordinary breadwinners and fathers.
It carries the message that although they appear to be office workers or middle-aged men living patiently for their families, the dignity they hold as a father and as a human being cannot be easily broken.
- The best scene chosen by So Ji-sub... "Minji, Daddy's here"
The actors' favorite scenes were also revealed.
Seo Soo-min, who played Minji, chose the scene "Minji, Daddy's here, let's go home" as her best moment.
She said, "Even though he is my father, he was so cool that I rewatched it several times."
To this, So Ji-sub also revealed that the scene was one of his favorites, saying, "Since we picked the same scene, it feels strange, like we are in sync."
Yoon Kyung-ho chose the final meal scene between Agent Kim and Minji. He explained that Minji's short line, "Eat slowly," left a deep impression.
Surprisingly, So Ji-sub revealed that the line was actually an ad-lib by Seo Soo-min, which surprised everyone.
Though brief, the line captured the bond of a father and daughter who had relied on each other for a long time and the lingering sadness of their impending parting.
- 'Agent Kim Reactivated' leaves a legacy of family over action
Finally, PD Lee Seung-young expressed his gratitude to the actors and staff.
He said, "Great acting comes from a moment of immersion. It is not easy to repeat a scene ten times from different angles to get it right, but it was possible because everyone participated to create a great scene."
'Agent Kim Reactivated' was loved for its flashy action and tense narrative, but ultimately, it was the universal emotion of family that moved the viewers' hearts.
The character of Agent Kim, played by So Ji-sub, symbolized all the ordinary fathers in the world: those who endure silently, sometimes crumble, but ultimately stand up again for their families.
The final message captured the essence of the work: "I cheer for all the fathers and families in the world. And daughters actually love their fathers very much."
'Agent Kim Reactivated the Universe' once again showed the sweat behind the action and how a drama is ultimately completed through the stories of people and family.