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Identity replacement, with the development of time, has become increasingly unsuccessful. If Hosho Wataru and Hosho Tomomi's case had occurred in ancient times, they might have indeed succeeded and possibly even become the subject of legendary stories—just like in "Journey to the West: Proving Book", where the boatman, after killing Tang Sanzang's father, could impersonate an official for over a decade, enjoy all the glory and riches, and evoke envy, jealousy, and hatred in many.
But in the modern era, it's not so easy. There are so many ways to prove whether one person is actually another, and just the health insurance records alone are a difficult hurdle to clear. Nanahara Takeshi, this "blind man", was fumbling through Aiyama Omomi's health insurance records, asking random questions, until Takarayama Tomomi finally couldn't maintain her façade and broke down—putting aside who exactly killed Oguri Ginkawa, just the death of Omomi implicates her deeply.
