Will be leaving for Seoul in a few days, first time visiting! We will be staying at the Sheraton D Cube for 5 days (thank you SPG card). I wonder how much US cash we should bring?
a) may be 1,000,000KRW

Can we get by mostly using our Ink Bold or Chase Sapphire Preferred cards?
a) my brother used a chase sapphire preferred card.

Is the US dollar commonly accepted there or will we need to change into KRW currency? Where should we go to exchange US dollars into KRW?
a) most korean accept KRW. u must have korea money. u can exchange in airport and any banks.