Siheyuan: Making Jia Zhangshi Eat from the Start

[Siheyuan + Overlord System + Power Fantasy + Sharp-Witted Hero] Zhang Shan transmigrates into Love in the Courtyard, only to find himself in the worst possible situation from the start. Both his parents are dead, and his only remaining relative, his grandfather, has also passed away. He is bullied by the vicious residents of the Siheyuan. Then he awakens the Overlord System! Jia Zhangshi wants to steal my corn? I'll make you eat dirt. Jia Dongxu wants revenge? I'll knock every last tooth out of your mouth. He Yuzhu won't back down? So what if you're a battle god? I'll beat you all the same!