The plate that synthesized the video emits light.

I’m a beginner. When I put a video shot with Guileen Screen on a plate

and changed the Directional light to the night setting,

this video itself became a phenomenon that emits light.

The shading model of the material is unlit,

but there is no change. How does this happen?

Hey there @Hiroakifuruse! Welcome to the community! Generally unlit materials don’t produce light unless your project uses Lumen which takes into emissives into account and creates light, or bloom which looks a bit like light but not quite. Try disabling Lumen and lower your bloom in your post processing settings and see if that helps!