Korea

Korean etiquette is built around a clear sense of age and rank (nunchi), from how you bow and hand over a business card to how you drink with someone older than you. Getting the hierarchy right matters more here than in most cultures on this list.

11 rules.

Bow and use two hands with seniors

Place rice to the left of soup

Avoid sets of four, knives, and clocks

Skip white flowers, red ink, and shoes as gifts

Don't open a gift in front of the giver

Bring a small gift when visiting someone's home

Take your shoes off entering any home

Turn away when drinking with elders

Never write a living person's name in red ink

Number 4 is unlucky, 7 is lucky

Use a title or honorific, not a first name