When passing bowls, glasses, or dishes, always use both hands to show respect. For Koreans, it's also considered rude to refill your drink, especially for alcohol. Always pour for others at the table, and let them fill yours.
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Slurping and belching are acceptable while dining, and is sometimes considered a sign of appreciation of the cooking. Tipping is not a part of the culture in Korea.
Impolite, Rude and Offensive Behavior in KoreaIf you have the sniffles or are stuffed up, it is best to excuse yourself and blow your nose in a rest room. Yawning loudly and chewing gun in public are also considered rude.