Stronger by Killing

Crossing into a high martial world, Gu Zhan acquires a system that allows him to become stronger by killing enemies. After transmigration, Gu finds that he is seen as a thorn in the side by someone for the original body owner was killed by Gu's own maid. “Just for this? You want to poison me?” “Have you considered why people treat you respectfully?” “Of course, it's because of my demeanor, and my beauty!” “No, it's only because you are my maid!”