We first reviewed the overall content structure of the site, clearly redesigning the user flow and information prioritization. On top of that, we implemented responsive design based on a mobile-first approach to optimize for comfortable viewing on all devices. Technically, we emphasized performance improvement by implementing a lightweight framework, appropriate image optimization, and cache control. For SEO measures, we focused on embedding structured data, optimizing meta information, and designing keywords for each page to contribute to the expansion of search traffic. Additionally, in terms of design, we adopted a sophisticated visual style that aligns with the brand's tone, achieving both credibility and a modern impression. As a result, quantitative and qualitative improvements, such as an increase in user stay time and inquiries, have been confirmed.