China is changing its approach to becoming a major power, focusing on building new relationships with other countries. The US and China are competing in East Asia, leading to tensions. Some experts believe power shifts may happen in the region, but others trust the stability of the US-led world order. The region's security and economy are affected by alliances and conflicts between countries like the US, Japan, South Korea, China, Russia, and North Korea. The study analyzes China's growing influence in East Asia and its strategies towards the Korean Peninsula. China aims to strengthen its power by utilizing its relationships in the region. The emergence of new major powers in East Asia, along with North Korea's nuclear threats, pose challenges to South Korea's security. The study explores how China's strategies could impact South Korea's security and suggests ways to respond.