The talented painter Wen Yizhou carefully planned a "perfect murder" in order to escape from the mental control and harassment of curator Song Yanqiu for five years. He personally killed Song Yanqiu in the mirror room, leaving a chain of evidence pointing to him, intending to sacrifice himself to protect his lover Pei Shiyun, a criminal profiler.
However, he didn't know that Pei Shiyun had already understood everything. After Wen Yizhou left, Pei Shiyun sneaked into the scene, tampered with evidence, left misleading clues, and completed another "perfect crime" in his own way - he wanted Wen Yizhou to be exonerated and became the "second person" who was not discovered.
When Wen Yizhou was arrested, retracted his confession, and confessed, and when Pei Shiyun intervened in the investigation as a profiler, walking between lies and truth, the two fell into the abyss for each other. The confrontation in the interrogation room, the game in the chain of evidence, the guarding in the dark night - they thought they were shouldering the responsibility alone, but they didn't know that the other party was already walking side by side.
This is a sacrifice in the name of love and a two-way redemption. When all the lies were revealed and all the evidence pointed to the same answer, they discovered: the most perfect crime is not to hide it from the police, but to hide it from each other.
In the end, what they have to face is not the judgment of the law, but each other's choice.
Purpose: redemption