The 'Realist Hero Rebuilt the Kingdom Light Novel' focuses on a hero's journey in rebuilding a kingdom. He starts with assessing the current state of the kingdom which is likely in a dilapidated state in terms of governance, economy and social harmony. He then formulates plans. For economic revival, he could promote new industries or trade routes. Politically, he might restructure the power hierarchy. Socially, he aims to improve the living conditions of the people. Through a series of such actions and facing multiple obstacles along the way, he attempts to fully rebuild the kingdom, which is the central plot.