Lin Yan, a cultural relic restorer, took over a broken bronze mirror of unknown origin. After the mirror opened, she actually saw Shen Zhu, the manager of Jingzhou from thousands of years ago, in the seven-minute window. Modern restoration records and ancient case files corroborated each other. Starting from a disappearance case in a secret room, the two gradually discovered that every trace that appeared in the mirror pointed to an old case that spanned time and space. But when they finally found the exit left by the missing person, new marks came from a tomorrow that had not yet happened.
