Lin Feifan was originally an ordinary modern youth who traveled through time to the Da Qian Dynasty, becoming a half-baked poor scholar who could only recite a few poems and wrote terrible bagu essays. Failing repeatedly in imperial examinations, everyone laughed at him for having shallow knowledge and being unfit for high society. But little did anyone expect that hidden in his belly were not the writings of sages, but modern mathematical and scientific common sense, basic logic, and practical thinking. While others studied scriptures hard to fight for fame, he used simple geometry to measure farmland, relied on basic arithmetic to clear up grain accounts, and used simple physical knowledge to cleverly solve livelihood problems. By a twist of fate, he entered the Ministry of Revenue yamen, facing years of accumulated abuses, chaotic account books, and land disputes, against which a crowd of veteran clerks was completely helpless.