Beneath the neon lights of Fozhou City lies a strange, long-forgotten taboo: if you wake in the middle of the night, never check the time. Xiaomi, an outgoing and energetic young woman, has just moved into a rental in the old quarter, and scoffs at the rule passed around by word of mouth among the neighbors. A party lover and restless night owl, she is always roaming the city streets after dark, never without her phone or watch. Checking the time has become second nature. Then, at three one morning, she glances at the numbers on her screen, and strange events begin one after another: an unfamiliar shadow appears in the mirror, the ticking of an old grandfather clock echoes endlessly in her ears, and people around her start disappearing at “specific times.” Before each incident, she has checked the time without fail. As Xiaomi tries to uncover the secret behind the taboo, she discovers an abandoned clock factory hidden in Fozhou City's old quarter. Its countless clocks, all stopped at midnight, are quietly devouring anyone who breaks the rule. Her outgoing, restless nature becomes the most dangerous catalyst. Every time she actively searches for answers, she edges closer to the abyss of time, and her only way out seems to be giving up the right to “know what time it is” entirely.