Korean Dining and Bathhouse Etiquette to Know

You'll need to take off your shoes at floor-seating restaurants and hanok cafes — most have a shoe rack at the entrance or an obvious spot to leave them, so glance at what other guests are doing if you're unsure.
When someone older or someone you're meeting for the first time pours you a drink, it's polite to hold your glass with both hands, or one hand on the glass and the other lightly touching your arm — even done a little awkwardly, this alone leaves a good impression.
Side dishes are almost always refillable for free — if the kimchi or banchan run low, just tell the staff '이거 좀 더 주세요' (a bit more of this, please) and they'll top it up at no extra charge.
Most jjimjilbangs and public bathhouses restrict entry for visible tattoos, or require covering them with a sticker — if you have a large tattoo, it's safer to check with the front desk before entering.
Some restrooms (especially in older buildings or smaller regional towns) post a sign saying not to flush toilet paper — in that case, use the bin next to the toilet instead. Most of central Seoul is fine to flush directly, but always follow a posted sign if there is one.
A light bow is more natural than a handshake when greeting someone, especially with older people or on a first meeting — a small nod of the head is enough.
At a restaurant, even if the first person to arrive is already seated, it's standard manners to wait until everyone is seated before anyone starts eating.