Since their invention in ancient China more than 3,000 years ago, chopsticks have been widely used in Asian countries. In South Korea, 'jeotgarak' means chopsticks. Being an important tool for dining, Koreans learn to use 'jeotgarak' as infants. Koreans consider the handling of chopsticks a necessity for good table manners, and for children and adults alike, table manners are very important. This even extends to the manner in which the chopsticks are presented in the table setting: in Korea they are placed vertically on the table.

https://korea.stripes.com/food-drink/korean-kitchen-why-koreans-use-metal-chopsticks

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