CREATE TABLE table_204_311 (id DECIMAL, "rank" DECIMAL, "nation" TEXT, "gold" DECIMAL, "silver" DECIMAL, "bronze" DECIMAL, "total" DECIMAL)

who came after south korea with the most gold medals won ?
SELECT "nation" FROM table_204_311 WHERE "gold" < (SELECT "gold" FROM table_204_311 WHERE "nation" = 'south korea') ORDER BY "gold" DESC LIMIT 1
SELECT "nation" FROM "table_204_311" WHERE "gold" < (SELECT "gold" FROM "table_204_311" WHERE "nation" = 'south korea') ORDER BY "gold" DESC NULLS LAST LIMIT 1