The Bank of Korea submitted a written report to the National Assembly, revealing that the rapid expansion of single-stock leveraged ETFs targeting Samsung Electronics and SK Hynix may be amplifying structural 'herding' and volatility risks in the South Korean stock market. The combined market capitalization of the two companies has significantly increased in terms of both market value and trading volume, with their market capitalization share rising from approximately 36.1% at the end of last year to over 55% recently, and trading volume share jumping from 27.9% to 63.5%. South Korean financial regulators have expressed similar concerns, emphasizing the need for continuous monitoring of the potential impact of these products on market stability and systemic risk. Single-target leveraged ETFs may exacerbate one-way capital flows under changing market sentiment, and if market conditions reverse, the combination of intraday rebalancing and derivatives hedging mechanisms could further amplify price volatility.