This visualization presents a hierarchical tree of interconnected topics, starting with South Korea’s drug policy and branching into related subjects like districts, historical incidents, and naval ships. The structure uses jQuery and the D3.js library (version 3.5.17) in an HTML page, with CSS styling for nodes and links. Node circles have a white fill and steelblue stroke, while text labels use a sans-serif font; the tree branches are drawn as gray links. The data is predefined as a JavaScript object, and the visual relationships are rendered using SVG.