Wei San, a former top engineering student, finds herself reincarnated as an impoverished interstellar orphan cut off from formal education. Through scavenging and resourcefulness, she scrapes together enough credits to enroll in the prestigious military academy's opening semester, determined to pursue Mecha Engineering—a lucrative field aligned with her original expertise. Everything falls apart when a clerical error lands her in the Combat Pilot program instead, transforming the gentle, scholarly Wei San into a combat mecha fighter among bloodthirsty warriors. Refusing to accept defeat, Wei San schemes to teach herself mecha engineering during her mandatory combat training. When the military academy's live interstellar broadcast captures each pilot's rigorous preparations—devastating gravity resistance training, brutal close-quarters combat drills, and devastating long-range weaponry practice—the cameras catch Wei San in an unexpected moment: cross-legged in the training hall, absorbed in a book. As the broadcast zooms in on the book's cover, the entire interstellar network reads the title simultaneously: "Qing Fei Teaches You to Become a Mecha Master in 21 Days." 【YY's melee combat is unstoppable—nobody survives her lightsaber!】 【ww's whip technique is absolutely legendary, insanely incredible!!!】 【What is Wei San even reading?】 The star network erupts. By the next morning, headlines dominate every feed: Military Academy Student Suffers Mental Breakdown During Combat Training, Attempts Career Change.