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So apparently, during the practice—when they were dancing. Those eyeballs weren't from the MC, they were from pudding, the cat... From the novel:
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Lord Pudding really has such a bad personality. Those things were originally byproducts of the cat trying to expand its territory. The cat liked the young lady and tested Gabriel, who was beginning to show interest in the young lady. Because without accepting even the side the cat showed, he couldn’t handle the young lady. And the result was like this – earning the cat’s disappointment.