An old policeman in a small town, Lao Hei, re-intervened in a serial murder case that had been investigated many years ago. And this time, it was the young and promising Xiaobai who was in the old position of Lao Hei. With the attention to "LITTLE THING", the case continues to have breakthroughs. In the end, the suspicion focused on a long-haired man. I thought that the truth would gradually surface. Unexpectedly, as Xiaobai irrationally killed the long-haired man by accident, it turned out that the old policeman had also dealt with the case. Killed a victim by mistake.
Old Hei didn't do what he said decisively to cover up for the little white face. In the memory, the past of forensic doctors to help falsify evidence is also revealed. This time it was Lao Hei who concealed Xiao Bai. From the hairpin that was burnt at the end, it can be seen that Lao Hei bought the same hairpin that was lost by the missing girl, making Xiao Bai think that he was the murderer by manslaughter.
When passing by the cross at the beginning, the audience thought that this redemption was to give a confession to the girl who lost her life and solve the crime.
But after helping Xiaobai conceal it later, he discovered that the real salvation was a relief to the girl who had killed the girl by mistake.
By helping Xiao Bai, Lao Hei let Xiao Bai feel at ease to let go of his mistakes.
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