Shu Lan, top mercenary instructor of the Gray Iron Delta, hides her identity and returns to China to retrieve top-secret archives, becoming a freshman at Lanzhou University. Facing the provocations of her partial biological parents and green-tea adoptive daughter, she uses violence to fight violence and ruthlessly abuses scum. Meanwhile, she has a narrow encounter with Lu Jinhang, a high-ranking official of the Inspection Bureau whom she severely injured. The two reach a cooperation in extreme probing, and Shu Lan smoothly infiltrates the interior of the Inspection Bureau. Relying on her top-tier skills, god-level medical skills, and hacker technology, the max-level BKing Shu Lan starts a high-burning and refreshing face-slapping life.