CREATE TABLE table_name_82 (english_title__chinese_title_ VARCHAR, airing_date VARCHAR, genre VARCHAR, number_of_episodes VARCHAR)
What is the english title of the modern drama, episode 20, that airs on 26 sep- 21 oct?
SELECT english_title__chinese_title_ FROM table_name_82 WHERE genre = "modern drama" AND number_of_episodes = 20 AND airing_date = "26 sep- 21 oct"