Memoir of a Murderer (2017) Spoiler-Free Summary – What It's About

In a quiet town where the ordinary rhythm of daily life masks hidden currents of violence, a former killer has slipped into the role of a modest veterinarian. Byeong‑soo lives among the gentle hum of animal clinics, yet his past as an assassin lingers like a shadow that refuses to dissolve. The routine of caring for stray cats and wounded birds provides a fragile sanctuary, but an insidious disease steals the edges of his recollection, turning even the most familiar streets into a maze of uncertainty. To anchor himself, he begins recording his thoughts each day, a habit that becomes both a lifeline and a reminder of the world he can no longer fully trust.

His daughter, a source of warmth and purpose, stands at the center of his fragile world. Eun‑hee balances compassion with a quiet determination to protect her father’s sanity, encouraging his habit of note‑taking and sharing moments of tenderness that illuminate the fading corners of his mind. Their bond is a delicate thread stretched between love and the looming threat that someone is watching, intent on pulling them apart. The looming danger is hinted at only by the uneasy feeling that a stalker is closing in, a presence that turns ordinary encounters into potential peril.

Enter a compassionate police officer who becomes an unlikely ally, offering patience and a steadying hand to a man whose reality flickers like a dying lantern. Byeong‑man brings a touch of humanity to the investigation, his warm demeanor contrasting sharply with the cold calculations of Byeong‑soo’s former life. Their growing friendship adds a layer of quiet hope amid the looming dread, suggesting that loyalty can survive even the most fractured of minds.

The film sways between tense, atmospheric suspense and moments of fragile beauty, painting a portrait of a man fighting both the erosion of his memories and the encroaching darkness of a hidden threat. The tone is hushed yet unsettling, inviting viewers to feel the claustrophobic pressure of a mind in decay while the world around them hints at unseen dangers, leaving the audience perched on the edge of anticipation.