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*System Transmigration Bottom x Black Bellied Top*
Kayan is a villain. His task is to be a whetstone for the male lead, to make him a suitable male lead. However, the male leads he met were all defects. They all lacked motivation. Even when they had him under their feet, they were indifferent. So Kayan changed his strategy. He worked hard to bond with the male lead, and after gaining their trust and affection, he turned hostile and betrayed them; stabbed him in the back, framed them, etc.