CREATE TABLE table_6961 ("Date" TEXT, "Title" TEXT, "Director" TEXT, "Producer" TEXT, "Production Cost" TEXT, "Singapore Gross" TEXT)

How much is the Singapore Gross for the film that Siu Wing directed?
SELECT "Singapore Gross" FROM table_6961 WHERE "Director" = 'siu wing'
SELECT "Singapore Gross" FROM "table_6961" WHERE "Director" = 'siu wing'