Based on the pace of change, reform strategy can be categorized as “Change and Adjust Strategy (CAS),” which emphasizes urgent and immediate implementation of necessary changes and making subsequent adjustments later; and “Plan and Change Strategy (PCS),” which involves the deliberate crafting of a perfect reform plan that is implemented in a gradual and systematic manner. The former strategy may either bring about the desired outcome or go in the wrong direction, while the latter strategy, despite being prudent and error-minimizing, runs the risk of interruption before bringing about concrete results. The initial South Korean defense reform plan, Defense Reform 2020 (DR 2020), started with strong ambition but failed to achieve any impressive result before being replaced by Defense Reform Plan 307 (DRP 307) in March 2011. The original DR 2020 planned to achieve reform of the South Korean military over the course of more than 15 years, ending in the year 2020. However, the change of administrations and Defense Ministers interrupted this plan. North Korea’s attack on the South Korean navy warship Cheonan in March 2010 also delayed the implementation of DR 2020. During the 51 months from the passage of the law for DR 2020 to the emergence of the new DRP 307, there was no meaningful implementation. South Korean DR 2020 clearly demonstrated the downside of the PCS.