Marsalisif and the Night Knight

Young Li Wei was humiliated by his teacher because of his poor math scores, and left school angrily. However, he unexpectedly encountered the self-proclaimed "Mathematics Demon" Martha Lisafu. After completing the oath and contract, Li Wei obtained mathematics expertise. From then on, his life ushered in earth-shaking changes. However, this change seems different from what he imagined? Li Wei's legendary life began.