Go Soo Rae is a form of ritual action from Korean folk religion, in which food is thrown into the air after shouting "Go Soo Rae" or "Go See Rae". This ritual stems from the belief that people will get ill if the ritual is not performed.
Folktale
The folk tale associated to this ritual comes from various regions in Korea. There is a story from the Andong region in Kyung Sang Book Do, North Kyung Sang state, about a poor woman with the family name of "Go". She survived with the help from the people from the village. After she died, people threw food in the air after shouting her name "Go See ne!", which means "to misses Go" in Korean.
References
Gosure Wikipedia(Text) CC BY-SA