南柯一梦 nánkē-yīmèng

[Nanke dream(from the story of a man who dreamed that he became governor of Nanke in the Kingdom of the Ants);illusory joy;fond dream] 唐代淳于棼做梦到大槐安国享受富贵荣华,醒来后发现乃一场大梦,大槐安国原来是大槐树下蚁穴。后用此典故比喻梦幻境界的事