Castle features a striking, high-definition art style that captures the noir aesthetic better than almost any other series in the genre. The visuals excel at depicting the contrast between the high-society glamour of the criminal elite and the brutal, gritty reality of the street-level violence. The combat is grounded, technical, and heavy every punch and blade-strike carries a sense of weight and lethality. Rendered in stunning high-definition, the dark alleys and neon-lit boardrooms of Seoul become a character of their own.