What genre is revolving doors of vengeance 酒店風雲?
CREATE TABLE "second_line_series" (
  "airing_date" text,
  "english_title_chinese_title" text,
  "number_of_episodes" real,
  "genre" text,
  "official_website" text
);
SELECT "genre" FROM "second_line_series" WHERE "english_title_chinese_title"='revolving doors of vengeance 酒店風雲';