In June 2025, Jisung Jung focused on enhancing documentation for core data structures and algorithms in the krafton-jungle/KJ-DS-BOOK-9-303 and KJ-ALGO-BOOK-9-303 repositories. He developed comprehensive guides for Balanced BSTs, AVL Trees, and Red-Black Trees, using Python and Markdown to provide clear code examples and visual aids. Jung also revamped Dijkstra’s algorithm documentation, introducing GIF-based illustrations and aligning terminology for consistency. His work improved onboarding and reduced support needs by making complex concepts more accessible. Through disciplined technical writing and cross-repository collaboration, Jung established a maintainable, high-quality documentation baseline for algorithms and tree data structures.