Seongjusin (, ) is one of the gods worshipped in Korean Gasin faith. Considered the supreme deity among gasins (), it is responsible for protecting the breadwinner. It is commonly referred to as Seongju () or Seongjo ().
Seongjusin is the guardian deity of the house and the eldest among the gasins. For this reason, This deity is enshrined in the daecheong, the cleanest place in the house. People often enshrine the Seongju by folding white paper into the shape of a flower and placing three spoonfuls of the sacred rice offered on the ritual table inside, or by folding white paper into a square and placing the rice inside. Sometimes Seongjusin is enshrined in a Seongju batangi (). In North Jeolla Province, there was a custom called Ttuk Seongju (), in which Seongjusin was worshipped only in one’s heart.
Every year on birthdays or holidays, a Jesa was done for Seongjusin, where housewives prayed for abundance and peace. Although the Seongjusin was worshipped alongside other gasins, when a new family was formed or a family moved to a new home, they would sometimes worship only the Seongjusin for a period of time.
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