Can You Become Stronger by Completing Questions? I Have a Big D Teacher!

Yu Han, a scumbag in mathematics who stayed up late to revise his plan, died suddenly of a myocardial infarction. As a result, he closed and opened his eyes and traveled to a different world, Tianti Xing, where "mathematics is king". His adopted sister Yu Xian, who was dependent on him for life, found out that her brother was cold and committed suicide without saying a word, so she also chased after him. What's even more outrageous is that the artificial intelligence in his mobile phone that is used to chat about every day - Teacher Big D, actually traveled through time together. In this world, "knowledge is power" is not chicken soup, but the law of physics. How strong your mathematics is, how hard your fist is - a great mathematician is a supreme powerhouse who can destroy the world. Yu Han, on the other hand, is a scumbag. ... But it doesn't matter, he has Teacher Big D.