Science and engineering student Hua Wuque transmigrates to a xianxia world, awakening the martial arts deduction system, which can only analyze the flaws of cultivation techniques and cannot directly kill enemies. He forms a sworn brotherhood in their youth with sword dao genius Feng Wuya, and they enter respective sects after the immortal gate selection. An ancient remnant scroll attracts the prying eyes of evil cultivators, entangling them in the disputes between the two factions of the Wanji Pavilion. External enemies invade and internal traitors cause chaos, with disasters following one after another. Without over-level suppression, he breaks the deadlock relying on rationality and deduction, step by step uncovering ancient secrets sealed for a thousand years.