In Korean dining, it's respectful to wait for the eldest at the table to eat first. Slurping noodles is acceptable and signals enjoyment. Never stick chopsticks vertically in rice — this resembles funeral incense and is considered bad luck.
주세요 (juseyo) — Please give me, 맛있어요 (massisseoyo) — Delicious, 계산서 (gyesanseo) — The bill, 건배 (geonbae) — Cheers, 더 주세요 (deo juseyo) — More please