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Protagonist: Lin Yue, 25 years old, a top mechanical engineer, proficient in mechanical design, physical mechanics, chemical synthesis, and materials science. He has participated in national-level heavy industry projects. He has a calm and rational personality, strong hands-on ability, and slight obsessive-compulsive disorder. After time travel, he comes with a streamlined version of the engineering database (requires energy activation). ? Worldview: The Great Yan Dynasty had a technological level similar to that of the Northern Song Dynasty. The nobles monopolized resources, had frequent wars on the frontiers, and the folk handicrafts were backward. There were low-level "mysterious arts" (essentially unanalyzed physical phenomena, such as geomagnetic anomalies and special ore reactions), which paved the way for the combination of later technology and "mysterious arts". ? The core of the cool point: Use science and engineering knowledge to reduce dimensionality and attack, from improving tools to making weapons and building infrastructure, cracking the "occult" scam, subverting traditional cognition, establishing technological power, and realizing personal value and dynasty transformation.