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There is a sound that only Lu Yu can hear - 1327 Hz. It was an alarm in his world, a frequency he couldn't turn off. Lin Xi's appearance was an accident. She just wanted to know why the boy who trembled when he heard the sound of an electric drill in the laboratory always wore headphones late at night and played the same song over and over again. It turns out that what some people are trapped in is never time, but a certain frequency that they cannot escape.