First of all, regarding pubic hair, there was no pubic hair at the scene because he did not rape.
So secondly, the DNA does not match for the same reason.
The photos of him when he joined the army made me feel like he was a comrade (the man with the gun has so smooth hands) and he doesn't like women. That's why debris is stuffed into their vaginas.
Moreover, according to "witnesses", he described the killings, but there was no "rape".
If you know Korean, you might as well listen to the lyrics of the song "Sad Love Letter". This is a song sung by a male voice.
The above is a personal opinion. Let me add a few words. In the movie, Feng Junhao gave the answer to the murderer, whether it was a close-up of his hands, a professional knotting technique (veterans), or the killing without blinking, but there was no evidence. What he wants to say is, is science the truth?
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