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investigative journalist Choi Min-ho wakes up every day at 6:45 AM, trapped in the same 24-hour time loop. Initially confused and terrified, he soon realizes that his looping is connected to a series of unsolved murders that all occur at exactly 6:45 PM. Using his repeated days to gather clues, Min-ho meticulously investigates each potential victim and suspect. He discovers a complex conspiracy involving a secret experimental drug that can manipulate human perception of time. With each loop, he gets closer to the truth, but also risks losing his sanity and his connection to the woman he loves, who exists outside the loop.

The film's time-loop mechanic is executed with precision and intelligence. The protagonist's growing desperation is palpable, and the central mystery is compelling. The final resolution is both emotionally satisfying and intellectually stimulating, offering a fresh take on a familiar sci-fi trope.