What Is Noise About?
The premise of Noise in 271 words, with nothing given away. The full story and the ending follow below.
In a crowded apartment complex where privacy exists only in name, Joo-hee’s quiet life is unsettled by persistent noises from above. What begins as neighborhood irritation quickly becomes a source of fear and fascination, sharpening her awareness of every wall, ceiling, and echoing corridor. Attempts to make sense of the disturbance pull her deeper into a mystery that feels increasingly intimate, personal, and impossible to explain.
Her older sister Joo-young is pulled into the search after Joo-hee disappears. Concern gives way to tense, unanswered questions as Joo-young returns to the home they share and considers the clues Joo-hee left behind. Detective Kim Hong-gyu approaches the disappearance with wary professionalism, while Ki-hoon, a colleague and close friend of Joo-hee, gives Joo-young a more personal view of the woman she knew. Their concern establishes a strong bond of sisterly loyalty.
The wider building slowly comes into view as a web of strained relationships and guarded private histories. Neighbors offer fragments of information, but their accounts raise as many questions as they settle, and Joo-young must decide whom she can trust without dismissing the uncanny side of what she encounters. Her investigation exposes the difficulty of proving what cannot easily be seen or measured.
Told with the atmosphere of a supernatural mystery, Noise turns an ordinary urban residence into a maze of sound, memory, and buried secrets. Each discovery deepens Joo-young’s uncertainty, while the contrast between everyday apartment life and creeping dread keeps the tension intimate. Her search becomes less about a single answer than about holding onto certainty in a place where every familiar detail seems to have acquired a second, disturbing meaning.
What Happens in Noise?
The complete story of Noise, from the first scene to the last, in 287 words (about 1 minute). Spoilers throughout.
Spoilers ahead
Joo-hee, a resident of apartment 604, becomes increasingly distressed by strange noises emanating from the unit above hers. Determined to find the source, she records decibel levels and installs soundproofing, but after receiving an eerie phone call consisting only of a woman’s laughter, she disappears.
Four days later, her older sister, Joo-young, is notified of the disappearance. While investigating the apartment, Joo-young finds soundproofing materials and a threatening note attributed to Geun-bae, the resident of apartment 504. Although Joo-young suspects Geun-bae of abduction, the police find insufficient evidence. The tension escalates until Geun-bae, convinced the noise is coming from apartment 704, is pursued by a ghostly figure and falls to his death from the seventh floor.
As the mystery deepens, Joo-young and a colleague named Ki-hoon uncover a dark history involving a former resident of 604 and the murder of the previous residents’ association head. While exploring a basement storage area, Joo-young discovers a sketchbook revealing a repressed memory: she had caused the car accident that killed their parents.
The climax unfolds when Joo-young recovers Joo-hee’s camcorder. The footage reveals that the noises originated from apartment 804, where a grieving mother had installed speakers to communicate with her deceased daughter. The woman admits to killing the resident of 704 and attacks Joo-hee. In a final confrontation in the basement, the woman from 804 is attacked by the ghost of the resident from 704, allowing Joo-young to “rescue” her sister.
In a tragic twist, it is revealed that a new neighbor cannot see Joo-hee. It becomes clear that Joo-hee actually died during the encounter with the woman from 804, and Joo-young, consumed by grief and unable to accept the loss, has been hallucinating her sister’s presence all along.
Noise Timeline: Every Key Event in Order
18 key events in the order they happen, from “Strange noises torment apartment 604” to “The truth about Joo-hee”. 12 events name a place, across 6 locations.
- 1
Strange noises torment apartment 604
Joo-hee, who lives in apartment 604, becomes disturbed by strange noises coming from her ceiling. She installs soundproofing material on the ceiling and records the noise levels with a sound meter. Shocked by the extremely high decibel reading, she angrily declares that she will gather evidence against whoever is making the noise.
Where:Apartment 604
- 2
An eerie laugh through the intercom
When the doorbell rings, Joo-hee answers through the intercom expecting a visitor. Instead of a person, she hears only the eerie laughter of a woman. The unsettling call deepens her fear about the noises coming from upstairs.
Where:Apartment 604
- 3
Joo-hee disappears
As the noises from upstairs continue relentlessly, Joo-hee takes her camcorder and leaves her apartment to find their source. This is the last time anyone sees her, and she soon goes missing without a trace. Her disappearance sets the entire story in motion.
- 4
Joo-young learns her sister is missing
Four days after Joo-hee's disappearance, her older sister Joo-young is informed by detective Kim Hong-gyu that Joo-hee has gone missing. The news prompts her to return to the apartment to search for answers. Her arrival marks the beginning of a desperate investigation.
When:Four days later
- 5
Searching Joo-hee's apartment
Inside the apartment, Joo-young finds a threatening note apparently left by Geun-bae, the resident of apartment 504. She discovers that Joo-hee had covered the living room with soundproofing materials, and also finds a strange mold-like substance in Joo-hee's room. The disturbing discoveries suggest her sister had been battling something far stranger than a noisy neighbor.
Where:Joo-hee's apartment
- 6
Confronting Geun-bae
Geun-bae arrives at the apartment and complains about the noise, claiming that he can no longer tolerate it. Joo-young later tells detective Kim Hong-gyu that she suspects Geun-bae of abducting her sister. However, the detective dismisses her suspicion, saying there is insufficient evidence against him.
- 7
Piecing together Joo-hee's last clues
Joo-young discovers a recording Joo-hee had prepared as a birthday gift for her, along with a hearing aid. She unlocks Joo-hee's phone and identifies the number from her sister's final call. Following the lead, she visits Joo-hee's workplace and meets Ki-hoon, who had been close to her sister.
Where:Joo-hee's workplace
- 8
Geun-bae's fatal investigation
Geun-bae becomes convinced that the noises are coming from apartment 704 rather than 604 and goes upstairs to investigate. There, the ghost of the woman who once lived in 704 appears and pursues him. While fleeing in terror, Geun-bae falls from the seventh floor and dies.
Where:Apartment 704
- 9
The threatening note changes
After Geun-bae's death, Joo-young discovers that the threatening note outside her apartment has mysteriously become blank. When she removes it, she finds her own name, 'Seo Joo-young,' scratched into the paper. The eerie message implies that she may be the next target.
- 10
Uncovering the building's dark history
Joo-young and Ki-hoon investigate the building's history and learn that a former resident of 604 was allegedly responsible for killing the former head of the residents' association, who lived in 704. Seeking answers, the two enter an unused basement storage area and become separated inside. Their exploration leads to the story's darkest revelations.
Where:Basement storage area
Show the other 8 events of Noise Hide the last 8 events
- 11
A corpse, a horrific sound, and an attack
While separated from Joo-young, Ki-hoon finds the corpse of the former 604 resident in the basement. Upon hearing a horrific sound, he begins behaving strangely. He later encounters Joo-young and attacks her, though she manages to escape.
Where:Basement storage area
- 12
The sketchbook reveals a family tragedy
In the basement, Joo-young discovers a sketchbook depicting the car accident that killed their parents. The drawings reveal a buried truth: Joo-young had distracted their father while he was driving, causing the fatal crash. The discovery forces her to confront her own long-hidden guilt.
Where:Basement storage area
- 13
A warning from the association head
Joo-young is found by the head of the residents' association, who tells her the police were called after she claimed someone was in the basement. She learns that the daughter of the resident of 804 had died years earlier after being struck by a delivery truck. The head's son, Yeon-woo, communicates through sign language and warns her that she has heard something she was not supposed to hear.
- 14
Ki-hoon's death and the camcorder
Joo-young discovers that Ki-hoon has died under mysterious circumstances. She returns to the basement and finds Joo-hee's lost camcorder. Hoping it holds the truth about her sister, she watches its final recording.
Where:Basement storage area
- 15
The final recording exposes apartment 804
The footage shows Joo-hee entering apartment 804 after realizing the noises were coming from there. She discovers speakers connecting the ceiling and floor, and witnesses the woman from 804 speaking as though to her deceased daughter. The woman admits to killing the former head of the residents' association in 704 before attacking Joo-hee, at which point the recording ends.
Where:Apartment 804
- 16
Hunted by the woman from 804
Joo-young finally finds Joo-hee in the basement, but the vengeful woman from 804 appears and pursues them. Joo-young hides her sister and attempts to lure the woman away. During the confrontation, the woman claims she never intended to kill the residents of 704 or Joo-hee, but that they had insulted her daughter.
Where:Basement storage area
- 17
The ghost of 704 intervenes
Just as the woman from 804 is about to kill Joo-young, the ghost of the woman from 704 appears and attacks her. The woman desperately begs Joo-young for help, but Joo-young shuts the door and escapes. She then finds Joo-hee and embraces her, telling her not to listen to the sounds around them.
Where:Basement storage area
- 18
The truth about Joo-hee
Some time later, a new resident moves into apartment 704 and visits Joo-young, who says she lives with her younger sister. Joo-hee appears behind her, wearing the same clothes as when she disappeared, but the new resident cannot see her. It is revealed that Joo-hee actually died during her encounter with the woman from 804, and Joo-young, unable to accept her sister's death, has been hallucinating her presence ever since.
When:Some time later
How Does Noise End?
The last act of Noise and what it means, in 281 words. The ending lands as bleak. Big spoilers: read the plot summary first if you have not seen it.
The final act, in full
Matt’s obsessive investigation into the chemical factory’s past reveals that there was no hidden secret or conspiracy, only the tragic aftermath of his family’s history. The factory’s real secret was a deep sense of guilt and regret carried by Pol, Matt’s father, who was responsible for the death of his wife, Michelle. She suffered from postpartum psychosis, which was hereditary, and she was overwhelmed by her mental health struggles when she drowned herself and their baby in the pond by the house. Pol’s attempt to save his son was noble but ultimately futile, and he was haunted by the loss of his wife, feeling responsible for her death. This grief fueled his dementia and led him to manipulate Matt’s perceptions, convincing him that there was some sinister secret hidden at the factory.
In a final act of bravery, Matt attempts to uncover bodies he believes are buried beneath the house by digging into the floor. Instead of finding any corpses, he accidentally opens a hole into the waterbed, suggesting that the actual remains are in the nearby lake. As Matt and Liv struggle with the water, they are rescued by Pol, who appears unexpectedly and pulls them out. The scene ends with Matt and Liv back at the house, seemingly at peace, but the film’s ending hints at Matt’s fragile mental state. As he stands looking at the pond, smiling, it suggests that he might be contemplating following the same tragic path as his mother. Ultimately, “Noise” explores how deeply family trauma, mental illness, and unresolved guilt can shape and distort a person’s reality, leaving the ending open to interpretation about whether Matt will recover or succumb to his inherited darkness.
What Kind of Film Is Noise?
Tense in tone, with variable pacing and a complex story, going by the plot summary.
- Tone
- Tense
- Pacing
- Variable
- Story
- Complex
- Intensity
- High
- Ending
- Bleak
A relentlessly unsettling mystery that coils from eerie apartment noises into murder, supernatural reckoning, and a devastating twist about grief and delusion.
- tense
- ominous
- claustrophobic
- haunting
- anxious
- grief-stricken
- crime investigation
- supernatural mystery
- family trauma
- grief and loss
Content notes: murder, violent attacks, fall from height, family death and grief, car accident, hallucinations.
Quiz
How well do you remember Noise? Test yourself on the story.
