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The ml is such a fighter! He fights for his life. He's a mistress's son and his father is actually rich, but he is treated badly to live as a slave. Luckily, the ml has transmigrated to this body, so he can fight back against all people who mistreat the previous owner of the body. Moreover, the ml is so smart and tricky to conceal his power, not letting anyone know about it. Such a smart boy!