Border Tower apprentice Ruan Zhiwei discovers the downstream rules of the lower levels, and during a wind wall crisis relies on real-time observation to guide the city out of danger, yet faces suppression from navigation chief Song Lieheng using seniority and power. Starting from a handyman, she advances through repeated real achievements, unites with observer Luo Qingyue, develops individual experience into a multi-person navigation system, and finally in a century-old turbulence and wind-eye crisis, defeats fixed authority with verifiable facts, becoming a true navigation officer.