share time: 2025-02-10 10:17:14
Astronomer Cheng Xing deciphers mysterious signals that turn out to be celestial coordinates sent by his late girlfriend Su Chen. In a remote town, he meets Lin Xiao, a B&B owner who looks identical to Su Chen. As he investigates, Cheng tumbles into a spacetime paradox—this 'stranger' knows intimate details of their relationship and is reliving Su Chen's final seven days. When the comet reappears, Cheng must unravel the parallel universe mystery to prevent history from repeating its tragic course.
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