Da Qin: I Level up by Killing Enemies, and Kill Mengtian at the Beginning

Travel through the Qin Dynasty, bind the enemy-killing upgrade system, and become stronger by killing enemies. At the beginning of the new camp, I beat up the veteran who came to "teach" the new recruits, and even yelled at Meng Tian in person. He asked me why I wasn't afraid of death? I answer: I want to make meritorious deeds. He looked at me deeply: "I remember you." Later he became my father-in-law, and later...