What is the english title of the modern drama, episode 20, that airs on 26 sep- 21 oct?
CREATE TABLE "second_line_series" (
  "airing_date" text,
  "english_title_chinese_title" text,
  "number_of_episodes" real,
  "genre" text,
  "official_website" text
);
SELECT "english_title_chinese_title" FROM "second_line_series" WHERE "genre"='modern drama' AND "number_of_episodes"=20 AND "airing_date"='26 sep- 21 oct';