Golden Reverence, Jade Melody

The male protagonist is gifted and good at psychological cryptography. Before he was invited to help the National Security Bureau solve the case, he had already entered the spy organization's blacklist. He was imprisoned, fought side by side with his college classmates, cleared his innocence, solved a long-standing spy case, and found the girl he had known since childhood. Finally, he became a cryptography expert police officer in the National Security system.