Set towards the end of the Joseon era, Sung Yi-Gyeom placed first in the state examination and he now works at the Hongmungwan. He doesn't have a goal or ambition for his life. One day, Sung Yi-Gyeom is caught gambling. As punishment, he is assigned to work as a secret royal inspector. His job is to eradicate illegal acts and corruption by public officers. He carries out his new job with the help of Hong Da-In and Park Chun-Sam. Hong Da-In is a female inspector and solves cases with Sung Yi-Gyeom. Park Chun-Sam is Sung Yi-Gyeom’s servant. Park Chun-Sam is talkative, affectionate, and tearful. Meanwhile, Sung Yi-Beom is Sung Yi-Gyeom’s younger stepbrother. His father is a nobleman, but his mother is a slave. Due to his mother's low social status, his father does not accept him as his real son and he is barred from having certain opportunities. He opposes his older stepbrother Sung Yi-Gyeom.
Aliases
- Secret Royal Inspector
- Blade of the Phantom Master
- Royal Secret Agent (2020)
基調輕鬆的推理調查劇，講述朝鮮時代的王室秘密調查官——暗行御史以及御史團的故事。 暗行御史是王的耳朵、百姓的嘴巴，他們剷除政府腐敗、對抗不正之風、為百姓申冤，堪稱朝鮮時代的「Kingsman」。
