I Was Assassinated by Dusk

The sunset is infinitely beautiful, but it's almost dusk. At first, the world only regarded this poem as a lament for the end of the beautiful scenery. It was not until dusk fell that day and human beings fell in pieces like harvested wheat that people suddenly realized that it was an ominous prophecy that foreshadowed catastrophe. From then on, there was a taboo in the world. You must not appear outside after dusk! What is hidden under this dusk?