CREATE TABLE table_74189 ("Tour" TEXT, "Mens singles" TEXT, "Womens singles" TEXT, "Mens doubles" TEXT, "Womens doubles" TEXT, "Mixed doubles" TEXT)

Who is the mixed doubled on the tour korea super series?
SELECT "Mixed doubles" FROM table_74189 WHERE "Tour" = 'Korea Super Series'
SELECT "Mixed doubles" FROM "table_74189" WHERE "Tour" = 'Korea Super Series'