4 ideas
The private detective Yu Bul-lan, whose name deliberately echoes Maurice Leblanc, pursues the killer through disguises, false identities, and staged scenes. The murders turn out to be driven by revenge for a wrong buried in the past, so solving the case means excavating that history.
The Western detective story reached colonial Korea mainly through Japan rather than directly from Poe, Doyle, or Leblanc. It arrived already reshaped by Japanese adapters such as Edogawa Rampo, so the first Korean practitioner inherited the Japanese variant's tastes along with the Western form. The borrowing shows in the naming itself: a Korean detective named after a French author, operating in a Rampo-style plot.
In the Rampo-influenced mode, a mystery holds readers mainly through the grotesque, the uncanny, disguise, and theatrical reversals, and the puzzle a reader could solve along the way matters less. Daily newspaper serialization reinforced this, because each installment needed a shock or cliffhanger to bring readers back the next day. The result is detective fiction built as melodramatic spectacle more than a logic game.
Under colonial rule, the police and courts belong to the occupier, so a native detective novel can't comfortably celebrate state law enforcement. This lens predicts that such fiction will place justice in a private, individual investigator. It also predicts that the story will keep its conflicts in personal passion, family secrets, and revenge rather than politics, which suited both the censors and readers' wish for a competent hero of their own.