Man-su Lee Byung-hun is a proud, award-winning veteran at Solar Paper, a papermaking company where his skills and loyalty have earned him a comfortable, well-paid life. He buys his childhood home and enjoys a luxurious routine with his homemaker wife Mi-ri Son Ye-jin, their teenage stepson Si-one Woo Seung Kim, and their young daughter Ri-one So Yul Choi. The family also lives with an antisocial, neurodivergent cello prodigy and two dogs who bring their own quiet challenges and moments of warmth. For a long time, life looks stable and predictable, and Man-su savors the security he has built after years of hard work.
All of that begins to unravel when Solar Paper is bought by American interests, and a wave of layoffs follows. The company fires many workers, and Man-su is among those left stunned and devastated by the sudden turn of events. After breaking the news to his family, he makes a bold, if dangerous, promise: he will return to papermaking and secure his position again within three months. The dream of reclaiming his old life fuels him, even as the reality of unemployment and the strain it places on his household begins to bite.
Thirteen months slip by, and Man-su finds himself working low-paying retail jobs rather than returning to the factory floors he knows so well. The family tightens its belt to make ends meet, cutting back on nearly everything. They even have to give up their dogs and put them with Mi-ri’s parents, a decision that weighs heavily on Ri-one. The burden grows heavier when Ri-one’s teacher pushes hard for expensive, advanced cello lessons, a dream that seems increasingly out of reach given the mortgage payments that loom over the home. Mi-ri picks up work as a dental assistant to help stretch the family budget, while Man-su faces a nagging toothache that he refuses to treat, stubbornly insisting on his own stubborn pride and self-reliance.
Determined to rejoin Moon Paper, Man-su faces humiliation at the hands of Seon-chul, a manager who stands between him and a hopeful return. The humiliation ignites something darker in Man-su: a growing fixation on reclaiming his lost status and securing his family’s future, even if it requires drastic action. He nearly sabotages Seon-chul with a pot of plant soil, a precursor to the lengths he is willing to go, but the moment passes when the company’s owner intervenes. Still, Man-su’s resolve hardens. He purchases the plant and uses it to stage a fake advertisement that allows him to sift through job applications and identify two candidates—Beom-mo and Si-jo—whose credentials exceed his own. The realization that these rivals could outshine him becomes a consuming obsession.
With a fragile plan in place, Man-su sets his sights on Beom-mo and Si-jo, and he begins spying on them. A twist of fate occurs when a snakebite temporarily interrupts his pursuit, and he is saved by A-ra, Beom-mo’s dissatisfied wife, who is entangled in her own web of infidelity. The two adults uncover each other’s secrets, deepening Man-su’s paranoia and pushing him further toward a breaking point. A-ra’s infidelity is exposed, and the triangle of suspicion intensifies as Beom-mo and A-ra become embroiled in a dangerous struggle over who truly controls the situation. In a frenzied confrontation at Beom-mo’s residence, A-ra shoots Beom-mo dead, and Man-su narrowly escapes the dangerous consequences of the chaos they have unleashed.
Driven by a need to restore balance in his own life, Man-su heads to a dance party where Mi-ri unexpectedly dances with Jin-ho, a suave dentist whom Mi-ri has begun to see romantically. The sight of this rival happiness rekindles Man-su’s rage and reinforces his sense of urgency. He returns to Beom-mo’s house, where A-ra and her lover have disposed of the body and buried Beom-mo and the gun. Man-su retrieves the weapon, and the cracks in his marriage widen as he and Mi-ri accuse one another of infidelity, their relationship strained to the breaking point. Yet in the same breath, they appear to cling to each other, choosing to reconcile rather than completely fracture.
On another front, Si-one, who works selling shoes, shares his own quiet hopes and fears, including a desire to protect his young daughter. Man-su reluctantly confronts Si-jo on a highway, and in a cold, fatal moment, he shoots Si-jo dead, hiding the body in his car. While this murder cascades through the family’s lives, Si-one and Geon-ho—Si-one’s friend—are busy stealing iPhones to resell from Geon-ho’s father’s store, drawing police attention that leads to an arrest. In a tense twist, Man-su and Mi-ri leverage Geon-ho’s father to take responsibility for the crimes, allowing Si-one to walk free, at least for now. Detectives inform Man-su of the disappearances of Beom-mo and Si-jo, and the investigation assets begin to point toward a chain of lurid coincidences that stem from the same man’s desperate choices. Si-one witnesses Man-su attempting to dismember Si-jo’s corpse, and the family’s secrets threaten to explode into the open. When the attempt fails, Man-su buries the corpse in the garden alongside the stolen iPhones, a grim image of the deceit fueling their lives.
Seeking some sense of control, Man-su visits Seon-chul’s home, where he drugs him with alcohol and then forcibly removes the cavities from his teeth, a brutal display of his desperation to dominate a rival who stands in his way. Si-one tells Mi-ri what he has seen, prompting Mi-ri to dig up Si-jo’s corpse but to lie to Si-one about it in an effort to safeguard him. Despite the growing truth around them, Mi-ri reaches out to Man-su to share her worries, but he remains resolute, refusing to change course. The mounting pressure culminates in a chilling act: Man-su suffocates Seon-chul, framing the death as a drunken incident that resulted in fatal choking on vomit.
Moon Paper ultimately decides to hire Man-su to replace Seon-chul, and this new employment marks a turning point: the family’s future—particularly their home and the dogs—appears stabilised once more. The detectives visit Man-su again, revealing that A-ra has implicated Beom-mo as a gunowner and possibly the killer of Si-jo, which shifts suspicion away from Man-su, who can finally see a path to normalcy. Yet even as he climbs back into a modern, machine-driven paper mill where workers are few, Man-su is left to contemplate the costs of his choices and the hollow victory of reclaiming a life built on fear, deceit, and violence. In the end, the family appears reunited, the dogs are back, and Man-su stands alone in a world that has grown colder, more mechanical, and forever changed by his desperation to recover what he once had.
