Zhèbù diànyǐng shēnkè de jiēshì le rénxìng de fùzá.
This film profoundly reveals the complexity of human nature.
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人性 is often discussed philosophically: 人性本善 (human nature is inherently good - Mencius) vs 人性本恶 (human nature is inherently evil - Xunzi). Also used practically: 人性化 (humanized/user-friendly).