In order to make the characters in his stories more vivid and realistic, Wu gets out and makes friends with people from all levels of society, studying their habits and ways of thinking and picking up their special vocabulary and jargon.
為了讓故事中的人物生動逼真，吳樂天平日四處走動，結交各階層的人，瞭解他們的生活習性、心理變化，同時蒐集他們所使用的語彙。