It would prove the meaninglessness of existence, but maybe there is meaning somewhere.
The result was just as depressing as anything else in this show.
According to a theory from Redditor and others, Detective Jin and the taxi driver at the end of the episode are the same person.
The long answer lies in the finale episode of the Netflix drama starring Yoo Ah In, , Won Jin A and Park Jung Min.
Again, the concept has potential but they didn't execute it very well.
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