The story concept
A tiny paper-like dragon and miniature fire truck appear after a chili bite. There is no real fire or injury. The glowing gate is a conceptual way to show nerve signaling, not a literal picture of a molecule or a measured temperature.
What the research actually says
Capsaicin, the pungent ingredient in chili peppers, activates a receptor on sensory nerve cells that also responds to painfully hot temperatures. Researchers identified this receptor in a 1997 study. It is now called TRPV1.
Where the evidence stops
This mechanism helps explain why chili feels like burning. The paper did not test our cartoon character, measure his tongue temperature, or show that every spicy-food reaction is harmless. The video does not claim that hot food cannot cause a real thermal burn.
The useful takeaway
The mouth can feel heat-like pain from a chemical signal. That does not mean the pepper has started a literal fire. The sensation deserves respect even while the dragon is a joke.