Hi, I am Yujin Kang, a Ph.D. candidate advised by Professor Yoon-Sik Cho in Data Science Lab, Chung-Ang University. My research centers on a fundamental question: how should we handle data to make AI systems more trustworthy and accessible? I have explored this across diverse data types—from emotional language and structured relational data to sensitive medical information and user behavioral patterns. Currently, I am focused on making LLM reasoning processes more transparent by developing explainable AI systems that can articulate not just what they conclude, but why. My long-term goal is to bridge the digital divide by building AI systems that are interpretable and accessible to all users, regardless of their technical background, ultimately transforming AI from a computational tool into a reliable partner that connects people with technology.