The real murderer appeared at the end of the movie, and a passer-by with a frontal shot of no more than 2s.
It's hard to accept, of course, but put on a few pictures and maybe you'll accept the fact.
Carefully observe the comparison, you will find that the real murderer's hand is quite different from Park Xinggui's hand. If this does not prove that Park Heung-gyu is not the murderer, please read on.
From these two points alone, it can be concluded that the real murderer is a passerby with a shot of no more than 2 seconds. Some people will definitely think it is too hasty, but this movie is adapted from real events, and the murderer has not been caught when the movie is released, so this is the case. The case has always been suspicious. The director will not clearly reveal the identity of the murderer, nor does he know, because the murderer is still a passerby. We have no way of knowing who he was.
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