short summary
The boy was seeing a hallucination. He tried to force them to believe the mermaid, but others doesn't allow him to imagine freely.
my evaluation
This short video is a sarcasm. I thought the boy was either mentally deranged or running away from reality. I've heard that people start to hallucinate when they are strongly preoccupied with something in their minds. Apart from that, I also wondered why other people force him to let him see the reality. What did he do to those people?
what will happen at the end
After he see the reality, it seemed he had a big shock, and again, he was running away from reality in another way. I hope he doesn't suicide.
https://science.howstuffworks.com/environmental/green-science/carbon-capture.htm