A 68-year-old mother who could not swallow even a sip of water without her dentures.

But one night, she vanished without a trace, leaving her dentures exactly as they were in the cleaning cup by her bedside.

The police closed the investigation after three days, classifying it as a simple disappearance of an elderly person with dementia, and

her son spent five years falling apart, clutching the cup containing the dentures.

And five years later, a note written in crooked Korean is discovered in a detention complex across the sea in Cambodia.

"Please find my son, Jung Woo-jin."

A single small cleaning cup that had been asleep in the evidence box for five years—

The truth hidden within it is finally revealed.

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