CREATE TABLE table_17953 ("Season" CLOB, "Airdate" CLOB, "The Mole" CLOB, "Winner" CLOB, "Runner-up" CLOB, "Prize money" CLOB, "International destination" CLOB)

what's runner-up with season being season 13
SELECT "Runner-up" FROM table_17953 WHERE "Season" = 'Season 13'
SELECT "Runner-up" FROM "table_17953" WHERE "Season" = 'Season 13'