Was X setting up the trashcollector as the murderer?
When in jail, Yoon nodded in response to seeing the cell phone picture of the old man trash-collector. I don't remember what his mother asked him, something like "is he the one?" What did Yoon's nodding mean? Did he really think the old man killed the girl? or was he setting the old man up? Or did he just remember seeing the old man? Whatever Yoon mean, his mother clearly took his nod to mean that the old man was the murderer.
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