In 1981, a modern man awakens in the body of a teenage repeat student in rural China, thrust into a world where education is scarce, poverty is pervasive, and the college entrance exam is the only ladder to a better life. Armed with future knowledge and an unshakable determination, he begins tutoring classmates in math and science, quietly transforming their chances while navigating the rigid social hierarchies of post-Cultural Revolution China. As he outperforms everyone in mock exams and earns the respect of teachers and peers alike, he also draws the ire of privileged bullies and suspicious authorities.

Amidst the smell of oil-printed tests, homemade cigarettes, and chalk dust, he rebuilds his identity—not as a time-traveling genius, but as a boy who remembers what it means to hope. With every correct answer, he inches closer to a future he once knew—and a past he must now rewrite.