Harris finds himself at a bar, eager to meet Rachel, a girl he connected with online. He boasts about his ability to guess her drink, a trick he often employs to impress women. After a quick encounter, he sneaks out from her apartment, claiming he has to work the next day. Upon waking up in his own place, he prepares for his job, where he spends his free time either rating girls on a dating site or engaging in edgy video games with a teen, whom he routinely mocks.
At work, Harris meets his despondent co-worker Robby, who is distraught over seeing his ex-girlfriend's engagement posts on social media. Harris suggests that Robby should delete her. Their boss, Terri Webster, praises Harris for his idea that was chosen over Robby's, scheduling him for an important meeting on Wednesday, to which he confidently agrees.
Later at the bar, Chuck, Harris' best friend, listens incredulously as Harris brags about his dating exploits. When Chuck probes about last week’s rendezvous with Rachel, Harris dismisses it, saying he felt no "girlfriend-vibe" from her. He then moves on to meet yet another girl, Lauren, employing the same routine as before.
Things take a turn when Harris receives messages from a captivating girl he noticed on the dating site, [Riley Miller](./actor/lili-simmons). Their encounter is unlike the others; when Harris attempts to leave after their night together, Riley challenges him on his excuse. She offers him the option to shower at her place, leading to an awkward confrontation before he manages to escape.
The next day, with his phone buzzing due to Riley’s incessant calls, Harris eventually gives in when she sends him a provocative picture. Their continued encounters lead to complications when he wakes up late for work, claiming ignorance about his alarm. Terri confronts him but allows him to keep his job—barely.
Riley, undeterred, surprises Harris by appearing at his apartment, prepared to cook him dinner. Unnerved, he attempts to feign his affection, tossing her stir-fry into the trash. As time progresses, Harris finds himself increasingly annoyed by her persistence and even starts to view her as a liability.
While at work, Harris receives an alarming prank call from Riley, fabricating an emergency involving his mother. This prompts him to avoid her further. He seeks solace at the bar with Chuck and [Lydia](./actor/kahyun-kim), only for Riley to interrupt, resulting in a dramatic fallout. As panic sets in, Harris begins to receive threats that play on his fears of Riley's intentions.
A hiking trip with Chuck leads to an alarming message from Riley, claiming she would commit suicide, prompting a reluctant Harris to check on her. Arriving at her home, he discovers her faking her death, igniting his rage. A physical altercation follows, culminating in an injury to Harris when he punches a mirror.
Consequences soon follow, as his Twitter account is hacked, leading to derogatory tweets about his boss, resulting in his dismissal. In a twist, police arrive to inform him of serious allegations involving inappropriate content on his laptop, leading to an arrest. With his lawyer advising him to plead guilty due to lack of evidence, his life spirals further out of control.
Bailing out with Chuck’s help, Harris spirals into despair, only to concoct a plan to extract a confession from Riley. Under the guise of an apology, he confronts her late at night, seeking vindication but ending up in a brutal altercation.
Desperate, Harris creates a fake profile to lure Riley out, leading to a planned intoxication at a bar. Unbeknownst to Riley, Harris swaps her drink, resulting in her kidnapping and a harrowing confrontation in a photo studio where he coerces her for a confession.
However, Riley cleverly turns the tables, attacking Harris and making a narrow escape, but tragedy strikes when Harris seriously injures her as she attempts to flee. In the film’s eerie conclusion, the realization dawns on Harris that he is free of charges—not due to his own merit, but because the true hacker was none other than the teenager he often ridiculed. As a security guard discovers him next to Riley’s lifeless body, Harris’ fate hangs in the balance, leaving the audience with haunting implications of his choices.
