Both Undercover High School and The Fiery Priest share similar elements in terms of plot and theme. In The Fiery Priest, the male lead was formerly an NIS agent who became a priest, and the series blends action, investigation, and spy-like scenes. Similarly, Undercover High School also follows a protagonist with a background in undercover work, involving investigations and justice for victims. Both series combine intense action with moments of comedy, making them comparable in style and tone.
