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[Quiet and introverted elementary school girl & dazzling basketball boy] On the sidelines of the court that year, Su Li's heart fell in love at a glance, and she became Song He'an's "Little Li Sister" forever. She hid her turbulent love in her painting book, but she did not dare to express it until her death. After passing away from illness, the dust-laden relics revealed a grand secret love. On a snowy night many years ago, when faced with Su Minglang's questioning, Song He'an sighed: "Maybe... There was a moment." His seventeen-year-old love finally lacked the courage to speak out, which became a belated epiphany and deep regret for the rest of his life.

There is a taboo in the century-old house on Qingshi Lane: if you count the stairs alone in the middle of the night, those who count to the thirteenth step will disappear forever. Lin Wan, a top student in the Department of Architecture, stepped into the old house to find his missing sister, but on the night of the thirteenth day, he saw his sister's wedding ring stuck in the gap on the twelfth floor. Criminal police captain Zhou Chenzhou appeared with three unsolved unsolved case files. He found that all the missing persons had received a structural diagram of the old house - the diagram clearly marked the twelve steps. When the two re-measured the height of the steps with ink lines, the smell of rust oozed from the damp brick joints. The same kind of iron filings left in the nails of the missing person pointed to the bizarre fire that killed twelve people twenty years ago...