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This is a snowy winter, and the Waixing'an Mountains have been blocked by snow one after another. Herbivorous animals in the mountains, forests and plains are facing a season of shortage of food, and deer, roe deer, and wild deer begin to migrate from the mountains. Carnivorous beasts that feed on herbivores either gather in groups or migrate to other places with herbivores. No matter what kind of animal, life in winter is extremely difficult. Whenever this season comes, there are always hunters with two legs who want to invade the mountains. They come to hunt animal furs in exchange for a lot of money. These people are crazy, and their desire to hunt swells like the cold in winter, swelling to the point of chilling and hardening. However, the five hunters who entered the Waixing'an Mountains this year came from Heilongjiang and have been in Russia for many years.

After Lu Xiaojun moved his family from City J to City B, more than nine months had passed before he knew it. Friday, September 15, 2017. Blow by the north wind, the sky in City B is blue. At nine o'clock in the morning, in the Mingde Building of University A in City B, Lu Xiaojun was checking criminal psychology information in the research room when he suddenly heard a knock on the door from outside. Lu Xiaojun opened the door, and the sturdy figure and smiling face of Officer Liu Lipeng appeared at the door. Lu Xiaojun shook hands with Officer Liu in surprise, and hurriedly invited him to come into the room and sit down on the sofa against the wall on the right.

Female judge Lu Xiaojun suddenly received a call from the police and learned that her student lover Cheng Luming had died mysteriously in Beijing. In shock and confusion, she decided to go alone to cooperate with the investigation, and at the same time explored Cheng Luming's mental journey over the years. Unexpectedly, what awaits her is not only the bitter past, but also complicated emotional entanglements and shocking secrets behind the death of Cheng Luming in the secret room...