Mousetrap: When a Brilliant Mystery Becomes Exhausting -- I survived it!!!

I had been looking forward to Mousetrap, which made writing this review a little difficult. I wanted to love it. In fact, for the first four and a half episodes, I genuinely thought I was watching something special.

The premise was fascinating, the atmosphere was unsettling, and the mystery immediately pulled me in. A man wakes up to discover someone has stolen not only his identity, but seemingly his entire existence. That is the kind of psychological thriller setup that instantly gets my attention. And then somewhere around the middle of Episode 5, I hit a wall.

So the story is about Je Moon-Jae, played by Ryu Jun-yeol, a novelist who had one big success years ago, who hasn’t left his apartment after being traumatized when his mother drove the car into the sea, killing herself and his father. Agoraphobic and medicated, he is content to let his college friend Son Su-Hyun, played by Moo Jin Sung, run his entire life for him: bank accounts, prescriptions, even the deed to his own home. That arrangement collapses the day Je Moon-Jae's fingerprint stops unlocking his phone. Within hours, he learns his apartment was sold out from under him, his identity documents were quietly re-registered by someone else two months prior, and a violent fixer named Noja, played by Sul Kyung Gu, who believes Moon-Jae vanished with money he embezzled three years back, is hunting him down. Cornered in an alley, Moon-Jae comes face to face with the reason for it all: a man wearing his own face.

Rather than staying enemies, Moon-Jae and Noja strike a deal; Noja will help find the impostor if Moon-Jae repays the

debt once his life is sorted out. It's an alliance of mutual leverage more than trust, and it drags both men into Seung Gyu's world, played by Kim Sung Oh, a gangster running an identity-laundering operation that erases homeless and vulnerable people and repurposes their identities. Add to this is a detective named Park Sun-Yong, played by Lee Kyu Hyung, who is chasing a related thread: an unidentified woman's body pulled from the Han River, and an anonymous tip that keeps pointing him toward Moon-Jae.

The deeper Moon Jae and Noja dig, the more the story splits into two versions of the past. One version, as Moon-Jae remembers it, tells of a manipulative outsider named Yu-Min, played by Park Yoon Ho, who wormed into his college writing club, stole his notebook, and later reinvented himself as "the Rat" out of envy. The other version was that Yu-Min was actually the talented writer. Moon-Jae was the envious one who got jealous of Yu-Min and wanted everything he had, including his girlfriend, whom Moon-Jae destroyed out of jealousy with anonymous rumors, driving her to suicide, then lifted Yu-Min's unpublished work wholesale and built his entire career on it. To avenge himself and the woman he loved, Yu-Min sold his own identity into Seunggyu's laundering network, faked his death, had surgery to become Moon-Jae's doppelgänger, and spent years methodically stepping into his victim's life: his name, his money, his public image, while Moon-Jae's guilt and mental illness made him an easy target to frame.

So, I am not exaggerating when I say this drama took me four days to finish because I had to keep taking breaks. It wasn't because it was emotionally devastating or because it was so intense that I needed time to recover. I was exhausted trying to keep up. Every episode seemed to introduce another revelation, another stakeholder, another hidden connection, another identity, another layer of deception. Instead of feeling immersed, I often felt like I was struggling to hold onto the story. The strangest part is that I walked away wondering whether the drama failed me or whether I failed the drama.

The deeper Mousetrap went, the less it felt like a mystery unfolding naturally and the more like a puzzle that

constantly changes its own rules. Every time I felt like I understood what was happening, the show revealed another hidden truth and forced me to reevaluate everything I thought I knew. Then it would do it again. And again. By the end, I felt like I needed a flowchart. The biggest source of my confusion was, unsurprisingly, Je Moon Jae himself. Or rather, the multiple versions of Je Moon Jae. We learn that Seo Yu Min had his life stolen and ultimately responds by taking over Moon Jae's identity. But then we discover Moon Jae himself is not exactly who we think he is. Then there is Park Sun Yong's connection to the entire situation. At a certain point, I found myself less invested in the emotional stakes and more concerned with remembering which version of Moon Jae was being discussed.

What fascinates me now, after sitting with the story, is that I think the confusion is partly the point. The more I think

about it, the more I realize Mousetrap is not really about crime, identity theft, or even revenge. It is about identity itself. Every major character is trying to become someone else.

Moon Jae steals a name, a life, a future, and even another person's accomplishments. After being victimized, Yu Min responds by doing essentially the same thing and going a step further, turning himself into an identical Moon Jae. He doesn't simply want justice. He wants to become the person who destroyed him. What begins as revenge slowly transforms into obsession. This was one of the most tragic elements of the story for me. Yu Min becomes someone deserving of sympathy, but as he lets himself be consumed by the very darkness he set out to punish, he turns as monstrous as the man he hated.

Which brings me to what I think is the drama's central message: when you spend your life stealing identities,

eventually you lose your own. Nobody in this story truly wins. The victim becomes an aggressor. The aggressor becomes a victim. The hunter becomes the hunted. The person chasing the imposter discovers he has been living as an imposter himself. The irony is almost suffocating.

As for the ending, I still don't know if I completely trust what the drama presents as truth. Just because Park Sun Yong and Noja reach a conclusion doesn't automatically mean it is the absolute truth. This series spends ten episodes teaching us not to trust appearances, narratives, memories, or identities. Why would the final explanation suddenly be unquestionable? That ambiguity is both one of the ending's strengths and one of my frustrations.

P

erformance-wise, the cast deserves a great deal of credit because they somehow manage to ground characters that could have easily become impossible to follow. The actors carry much of the emotional weight even when the narrative starts tying itself into knots. Ultimately, I admire Mousetrap more than I enjoyed it. It is ambitious, layered, and clearly the work of writers who were determined to create something more complex than a standard thriller. I genuinely respect that ambition. At the same time, there were moments when that complexity crossed over into exhaustion. Instead of building tension, the constant twists drained momentum. Instead of becoming more invested, I found myself becoming more detached.

I understand what the story was trying to say. I appreciate the themes of envy, identity, guilt, and revenge. I can

recognize the craftsmanship behind the intricate web of lies and stolen lives. But I would be lying if I said I wasn't relieved when it was over. Mousetrap is one of the most ambitious identity thrillers I have watched in recent years. It asks compelling questions about who we are, whether a stolen life can ever truly belong to the thief, and whether revenge inevitably transforms us into the very thing we hate. Unfortunately, for me, its increasingly convoluted web of identities, secrets, and interconnected subplots became more exhausting than engaging. By the end, I didn't care.

I didn't finish Mousetrap feeling satisfied. I finished it feeling like I had survived it. And honestly, I still can't decide whether that's exactly what the creators intended. If you watch this drama after reading this review, I would be curious to hear your thoughts.