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Seventeen years ago, Xu Wenxi's sister Xu Wenlan disappeared in Huishui Town. The official conclusion was that she fell into the water. Seventeen years later, she received an anonymous video: On a rainy night, under the Three Bridges, a paper boat was holding the ancient "river replacement" ceremony, and the girl wearing a red raincoat standing by the boat was her sister who had disappeared long ago. There is a popular rule in Huishui Town: when crossing the three bridges, you can't call your name, you can't shine the light, and you can't look back. Otherwise, the substitute will recognize the master and return home in disaster. Xu Wenxi returned to the town to investigate, but found that these taboos were not superstitions, but a set of silent rules that people could not see clearly, shout out, or recover. This year, the last Bihe is about to be held. The selected boy Chen Zhao suddenly disappeared, and the red raincoat skeleton was exposed in the culvert under the bridge. Everyone thought that Xu Wenlan had finally been found, but the identification results showed that the deceased was not her.