This interactive visualization displays average housing prices across Taiwanese counties from 2012 to 2020. Users click on a map of Taiwan rendered as SVG paths to select regions, which adds corresponding line charts to a time-series graph. The visualization uses D3 v5 for scales, axes, and line generation, with Vue and jQuery handling user interaction and state updates. Historical housing data is loaded from a GitHub-hosted JSON file, and each selected county appears as a colored trend line with a label in the right margin.