Who directed "A Tale of Two Hitmen"?
CREATE TABLE "table1_21666472_1" (
  "no_in_total" text,
  "no_in_series" text,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text
);
SELECT "directed_by" FROM "table1_21666472_1" WHERE "title"='\"A Tale of Two Hitmen\"';