Who wrote the episode "The Dream Lover", which was viewed by 3.96 million viewers?
CREATE TABLE "table1_17467578_1" (
  "series_num" real,
  "episode_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "u_s_viewers_million" text,
  "original_airdate" text,
  "production_code" text
);
SELECT "written_by" FROM "table1_17467578_1" WHERE "u_s_viewers_million"='3.96';