What's the title when the genre is drama and network of KBS2 happening before 2011?
CREATE TABLE "television_series" (
  "year" real,
  "title" text,
  "hangul_japanese" text,
  "role" text,
  "network" text,
  "genre" text
);
SELECT "title" FROM "television_series" WHERE "year"<2011 AND "network"='kbs2' AND "genre"='drama';