Mouse is a gripping psychological thriller that delves deep into the complexities of human nature, morality, and the age-old debate of nature versus nurture. This review explores how the series challenges perceptions of good and evil through a chilling crime narrative, layered character development, and a premise that dares to question whether monsters are born—or made.

Review
Mouse is a psychological thriller that pushes the boundaries of the crime genre by questioning the nature of evil, identity, and genetics. At its core is rookie cop Jung Ba-reum (Lee Seung-gi), who begins as a gentle, cat-saving neighbor, only to be thrust into a chilling moral labyrinth when he becomes entangled with a serial killer investigation. Partnered with detective Go Moo-chi (Lee Hee-joon), a burnt-out veteran haunted by trauma, and pathologist Oh Bong-yi (Park Ju-hyun), Ba-reum's journey from innocent idealist to conflicted participant defines the show's dark emotional core .
The concept—detecting a “psychopath gene” in fetuses—sets the stage for speculation on destiny versus choice. Through flashbacks and nonlinear storytelling, the series explores whether psychopathy is biological fate or a product of nurture, challenging viewers to ponder questions of free will and moral responsibility. Their chemistry—especially Ba-reum and Moo-chi’s complex mentor-mentee bond—adds emotional heft and authenticity.
Visually, Mouse adopts a cold, tension-filled style. Cinematography, shot composition, and flashback sequences create a sense of unease that mirrors internal conflict. The R-rated content is graphic and visceral, reinforcing the realism of its premise, though some viewers may find it disturbing .
A few caveats: the dense narrative occasionally becomes convoluted, and the pacing drags in the latter half, with flashbacks and subplots that stretch beyond necessity . Some twists, while shocking, verge on implausible, and the moral questions raised—especially around the genetics premise—don’t always land with nuance.
Despite its flaws, Mouse earned critical acclaim, high ratings, and international recognition, including a grand prize for Lee Seung-gi and a slot at the Series Mania festival . For viewers willing to navigate its complexity, the series rewards with a haunting, thought-provoking exploration of what it means to be human—and whether evil is inherited or chosen.
Mouse is a bold and ambitious thriller—visceral, provocative, emotionally charged. Its exploration of psychopathy, fate, and redemption, combined with standout performances, make it a must-watch for fans of cerebral crime dramas, even as its narrative excesses may frustrate some.
Information
Mouse is a 2021 South Korean psychological crime-thriller series directed by Choi Joon-bae and Kang Cheol-woo, with a screenplay by Choi Ran. The series aired on tvN from March 3 to May 20, 2021, comprising one season with 20 episodes, each approximately 70 minutes long. Starring Lee Seung-gi, Lee Hee-joon, Park Ju-hyun, and Kyung Soo-jin. Mouse is available for streaming on platforms including Netflix, Amazon Prime Video, Viki, and Viu.
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