Contributed to mdn/translated-content by delivering a comprehensive Korean translation of the Meta Programming guide for JavaScript, including detailed explanations and examples for Proxy, Reflect, and related terminology. Focused on localization and technical writing, the work ensured accuracy by fixing linter errors and refining Markdown formatting to meet repository standards, thereby improving documentation quality and accessibility for Korean developers. Additionally, addressed a documentation bug in eslint/eslint by updating JSDoc types in the HTML Formatter to reflect numeric values for totalErrors and totalWarnings, aligning documentation with runtime behavior and reducing IDE confusion. Work emphasized clarity, consistency, and maintainability.