Lin Yu, an eighteen-year-old transmigrator, has spent the last two years in a high-security ability prison, paying the price for his ruthless rise in the chaotic high school underworld. Once an abandoned orphan fighting for scraps, he awakened a system that allowed him to dominate the streets, accumulating a terrifying Battle Power Index and crippling countless enemies. Now released under mysterious circumstances, he finds his grandmother missing and his past life in shambles.

Immediately recruited by Wang Tulong, a powerful gang boss, Lin Yu accepts a lucrative role as a bodyguard and undercover student at the prestigious Balle High School. His mission: protect the boss's son while hiding his true identity and legendary status. As he steps back into a world filled with hidden masters, ranking lists, and violent factions, Lin Yu must navigate new conspiracies while seeking the truth behind his release and his grandmother's disappearance.

With a calm demeanor masking a beast-like ferocity, he is ready to crush anyone who stands in his way, proving that the terror of the high school world has truly returned.