Since the second U.S.-North Korea summit ended without reaching a final agreement, there has been no progress in the denuclearization of North Korea or in building peace on the Korean Peninsula. This is due to the gap between the definitions of denuclearization adhered to by North Korea and the United States, which has scarcely narrowed. These differences also exist between South Korea and the United States. Won Gon Park, a professor at the School of International Studies at Handong Global University, states that South Korea and the United States have different perceptions and approaches to sanctions aimed at resolving North Korea’s denuclearization issues. He adds that close cooperation between South Korea and the United States is essential for the denuclearization of North Korea. The author emphasizes that South Korea, which continues to change its stance in accordance with the changing denuclearization situation, should now develop a “Seoul Process” in its denuclearization policymaking. In other words, we need to come up with ways to lead the denuclearization situation rather than be dragged along.