South Korea's stock market is outperforming the rest of the world, with investors betting on the potential of the AI boom. This has led to a surge in Samsung Electronics, the world's largest manufacturer of memory chips, reaching a $1 trillion-plus market value. However, this concentration of wealth in one sector could potentially be problematic in a downturn. The gains in both companies have helped to boost South Korea's benchmark KOSPI index to new highs.