CREATE TABLE table_42224 ("Former kingdom" TEXT, "Province" TEXT, "Hangul" TEXT, "Hanja" TEXT, "Capital" TEXT, "Modern equivalent" TEXT)

What is the Hanja for the sakju province?
SELECT "Hanja" FROM table_42224 WHERE "Province" = 'sakju'
SELECT "Hanja" FROM "table_42224" WHERE "Province" = 'sakju'