The issue I am experiencing is a common headache in Yahoo Finance portfolios, particularly with newer or less-liquid ETFs like 0162Z0 (KB RISE Samsung Electronics SK Hynix Balanced 50). When Yahoo’s database doesn't explicitly flag the currency metadata for a ticker, it defaults to the portfolio's base currency (often USD) for the calculation while using the raw numerical price (in KRW), causing the massive valuation error you're seeing.