Kyungjun Lee enhanced the kyungjunleeme/kafka_study repository by developing and refining Chapter01 of the Kafka documentation, focusing on clarifying core concepts such as pub/sub, clustering, scalability, and data handling. Through technical writing and adherence to documentation standards, Kyungjun used Markdown to create content that emphasizes business benefits and reduced data movement, supporting faster onboarding and improved referenceability for Kafka operations. The work involved careful Git traceability across multiple commits, ensuring maintainability and transparency. While no bugs were addressed during this period, the depth of documentation laid a strong foundation for future feature development and team knowledge sharing.