Gu Mian, the dead-last student in Jing University's Computer Science Department, is actually G—the legendary elite hacker who once brought down global networks—hiding her brilliance in obedience to her grandfather's dying wish. Her boyfriend Cheng Ye and best friend Ruan Lu, who fancy themselves the "Security Twins," constantly look down on her. When Jing University is crushed at the Huaguo Sakura Intercollegiate Cybersecurity Competition, the whole team pins the blame on Gu Mian. Forced to step up, she reveals her S-class G identity, tears through the enemy's defenses in twenty-seven seconds, dramatically reverses the match, forces her opponents to apologize, and exposes their team's scandal. Ruan Lu's rumors backfire and ruin her reputation; Cheng Ye regrets everything and begs to reconcile, only to be rejected. At last, the hidden blade leaves its sheath—and its edge is fully revealed.