
Eh wait, am I the only dumb person that doesn't understand the end? Who is hanging up?

The uncle hangs up. He spoke to his sister, the mother of the young one

No no no.. it's nothing about dumb or not. Most sensei's one shots are just giving hints. The best way to be able to understand all is discussing.
>>> From the tied hand, the boy is the one who calling & hanging up. This is another clue that these two will be saved by his mom as she will definitely remember her own son's voice.
Beautiful men