CREATE TABLE table_31383 ("Value" TEXT, "Dimensions" TEXT, "Main Color" TEXT, "Obverse" TEXT, "Reverse" TEXT, "Watermark" TEXT, "Date of issue" TEXT)

What is on the reverse side of the 500 coin?
SELECT "Reverse" FROM table_31383 WHERE "Value" = '₩500'
SELECT "Reverse" FROM "table_31383" WHERE "Value" = '₩500'