CREATE TABLE table_31731 ("Hangul" TEXT, "Hanja" TEXT, "Revised" TEXT, "McCune-Reischauer" TEXT, "Estimated distribution  ( 2000 ) *" FLOAT)

Tell me the hanja of eum
SELECT "Hanja" FROM table_31731 WHERE "Revised" = 'eum'
SELECT "Hanja" FROM "table_31731" WHERE "Revised" = 'eum'