Slaying God, who was the ace of all secret agents and ranked first internationally. Yun Jian, in her previous life, was indeed a secret agent who was trained by the world's best underground assassination organization, the An Hun Group.
Due to her prodigious capabilities in her past life, the men under the An Hun Group could not keep a rein on her. Thus she, the Slaying God, became the only secret agent in history to have successfully left the An Hun Group.
She made her assassin debut when she was twelve years old, left the An Hun Group when she was fourteen, and killed Gu Sha Mercenaries' previous boss in the same year, replacing him and developing her own forces.
Secret agent Slaying God was, therefore, a legendary figure in the business.
To name someone who could be compared to top agent Slaying God, it would be the mastermind of An Hun.