Pim is a popular cheerleader while Putt is a bit of a social outcast with a leg brace for unknown reasons.
Their mother, Mai, is a working single mom, recently promoted to a higher paid job.
One day, Pim comes home from school to find Putt and his friend Fame playing video games.
Pim calls her mother to ask when she'll be home and tell her about Fame, but Mai informs her she has to stay late for a meeting.
Back at home, Pim answers the door to a man who says he's her grandfather, Phong, and informs her about her mother's accident.
Their grandfather informs them that their grandmother has dementia and might behave strangely he asks they help look after her during their stay and not to take anything upsetting she does to heart.
At dinner, Pim asks where Latte is and Wan tells her she let the cat outside, which greatly upsets Putt.
Wan looks at a blank spot on the wall where a clock used to be and informs Pim and Putt it's time for bed.
Back at their grandparents house, Fames threats of showing Pim the video are interrupted by Putt hearing a scraping noise coming from the hole, which has reappeared on the wall.
Putt looks through it and sees a young child with a black, hugely swollen face, with dark liquid dripping from their mouth and nose.
Fame attempts to look through the hole and gets a bloody nose, accusing Putt of pushing him and almost coming to blows before Pim gets home and breaks it up.
Phong gets irate and asserts that Chaiyut could have used his wealth to pay his friend to take the fault, and demands justice.
She is elated and begins to look for the blackmail video, but is interrupted by a scraping sound coming from the hole.
She tells Putt who looks and sees the girl with the black face standing in the room, now with a hole directly through her head.
A newspaper headline reveals that Chaiyut, the tycoon's son, has "walked free" after his friend confessed to being the driver during the hit and run.
Wan implies something happened that drove Mai apart from them, but refuses to say what, instead asking to see Putt's sketchbook.
Inside she sees a drawing of a girl with a spiral hole in her head and gets angry, while Putt denies he drew it.
Chiayut attempts to bribe him, then pulls a gun before being slammed into the steering wheel and beaten by Phong, who then pours the remains of the liquor over him and lights him on fire.
A younger version of Wan and Phong, who is in his uniform, come into view, talking to the woman who is revealed to be Mai.
Putt looks through the hole and sees Phong holding the bloody body of a young girl as Mai sobs.
Another flashback shows Krit dead on the floor from a gunshot wound to the head, which Phong says was suicide from guilt.
She is overjoyed to see Mai, who spurns her and tries to take her kids and run, but is stopped by Phong, brandishing his gun.
Putt continues to get sick, prompting Pim to tell Mai about the milk, connecting his illness to what she saw of Pinya.
Flashbacks show Wan treating Pinya cruelly due to her different face, before cooing over Pim for being a pretty baby.
Pim looks back to see the hole still there, and as Wan collapses, sobbing, Pinya is shown to be on the other side.
He then informs Phong that they retrieved evidence proving Chaiyut wasn't driving after all, making his murder meaningless.
Downstairs, Wan opens the closet to find Pinya's ghost, who hugs her and vomits blood.
Phong comes downstairs to find Wan thrashing on the floor, and sees a bottle of rat poison in her hand.
A flashback shows Mai looking through the hole, watching as Pinya hides in the closet, and Wan from the past, noticing the door is left ajar, closes and bolts it.
In her room, Pim lies on her bed, with the black ghost of Pinya laying next to her, holding her hand.