Developed a core dialogue system and quest dialogue design framework for the pacalso-jjc/2425-2nd-cc3-1b-rpg repository, focusing on scalable narrative infrastructure. Introduced a DialogueManager class to centralize dialogue flow, state management, and player interactions, supporting modular quest content. Documented quest dialogue trees for Sub Quest #4 and Side Quest #2 using Markdown, outlining branching options and progression paths. Emphasized object-oriented design and state management principles to enable rapid iteration and improved quality assurance. The work established a reusable, designer-friendly narrative layer, facilitating future quest development and QA automation while demonstrating skills in game design, narrative design, and collaborative documentation practices.