Beijing Criminal Police Li Huiyan came to the twin towers in a small town in the northeast due to a kidnapping case. By chance, he met the engulfing division who came to find the truth about his father's death. The two were accidentally involved in an entanglement that spanned thirty years... The night was closed, and the day shrouded. In a permafrost city standing in the north, twelve days and nights, reveal a secret about human nature to the audience. "Double Exploring" in the freezing cold of humanity nirvana and rebirth...