Table: tvb_series_2005_2
Columns: airing_date
english_title_chinese_title
number_of_episodes
genre
official_website

Question: What genre is revolving doors of vengeance 酒店風雲?
SQL: SELECT "genre" FROM tvb_series_2005_2 WHERE "english_title_chinese_title" = 'revolving doors of vengeance 酒店風雲'

Question: What is the english title of the modern drama, episode 20, that airs on 26 sep- 21 oct?
SQL: SELECT "english_title_chinese_title" FROM tvb_series_2005_2 WHERE "genre" = 'modern drama' AND "number_of_episodes" = 20 AND "airing_date" = '26 sep- 21 oct'