koreanfestivals1-3, Exercise 3: Bow, food, games and tteokguk

Model answer:

Sebae (세배): a ritual of filial piety in which people, dressed in traditional clothing, bow deeply to elders and say 새해 복 많이 받으세요 ("Please receive a lot of good fortune for the New Year"). Elders reward it with new year's money (sebaetdon), often in silk bags, and words of wisdom; historically parents gave rice cakes and fruit.
Foods: tteokguk (sliced rice-cake soup, usually in beef broth, eaten on New Year's Day and said to add a year to your life); jeon (savoury pancakes with fillings such as beef, oysters, kimchi or green onion); japchae (noodle dish of potato-starch noodles, beef and vegetables).
Games (any two): yutnori, kite flying, jegichagi, neolttwigi, gongginori, top spinning (Go-Stop is a modern adult substitute for hwatu).

The Tteokguk article says the origin of eating tteokguk on New Year's Day is unknown and mentions it in the 19th-century Dongguk Sesigi. The Seollal article says its origins "can be traced back to the 19th century" because of that book. The Tteokguk article's wording is more careful: a 19th-century mention shows the custom existed by then, but does not date its start.

Sources: Wikipedia, Korean New Year; Tteokguk; Yutnori.