Modern science has confirmed that humans evolved from primitive creatures. In the process of evolution, the gradually optimized DNA still retains a small part of the original genes. These genes determine the essential differences of each person. Although they are both human beings, their smells and habits determined by their original genes are completely different. In some special circumstances, it will return to its original form due to instinctive needs. ——The idea of this article comes from the setting of this Japanese comic. I would like to thank the author of "Natural Enemy" for reminding me of this setting~~~~~~~~~
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