People opened the coffin because of the barking of a dog. What was inside shocked everyone!

The story begins at a mourning funeral, when everyone present was deeply immersed in grief and sorrow. Suddenly, the dog, which had always been silent and calm, began barking furiously at the coffin. Her bark rang out over the burial site, penetrating the hearts of everyone present.

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画面の文字が早く変わりすぎます、最後まで読み終わらないうちに次の文字が出るので意味がわからないです