Extract all details regarding 'Korean primary sources' for Samsung and SK Hynix HBM and capex exposure, and note what is 'missing' according to the text.

South Korean media reports indicate that Samsung Electronics and SK Hynix are preparing to announce hundreds of billions of dollars in new investments [2]. Additionally, the Korea Economic Daily has reported that SK Hynix may raise up to $10 billion through a potential U.S. listing [11]. While these sources identify upcoming investment plans and potential capital-raising activities, the provided text is missing specific, granular details regarding the exact allocation of these funds toward High Bandwidth Memory (HBM) production versus other capital expenditures (capex). Furthermore, the sources do not provide official company statements or primary financial filings to confirm the specific breakdown of these investment figures.