The film does not set the contrast between positive and negative characters. Almost all the cops who came out were "bad cops" in some sense. But these bad cops have their own moral bottom line. They are greedy for money but capable. They make money from criminals, but do not use their positions to bully civilians. They will never kill. This is a typical setting for a "hardcore" detective story. It is more in line with the real complex human nature, and eliminates the preaching taste of Facebook. This is another triumph of mainstream Korean cinema. Broad and free expression of subject matter. They always put storytelling first, not caution and education. An important reason why Korean films produce good stories is that they never shy away from the so-called "dark side". If you don't touch it, those dark sides are still there, and you really write a bunch of bad cops, and no one thinks that all Korean cops are evil. When adults watch movies, especially mainstream feature films, what they see is an unreal story, getting into the situation, projecting emotions, pulling back to reality, that's all.
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