I researched on the Butterfly's dream, and this is what I found:
The Chinese philosophy of Taoism plays an important role in understanding Chuang Tzu's parable "The Butterfly's Dream." The story begins when a philosopher dreams he is a butterfly. His is disoriented by this transformation until other butterflies welcome him into their group and he begins to behave as the other butterflies in accordance to his appearance. He takes in their sensual pleasures and carefree way of life. He comes to enjoy his life as a butterfly until he wakes from his dream and is startled by reality. But, upon reflection, he realizes that his waking life could be for others a butterfly's dream.
that's the definition, and the actual text:
Zhuangzi - [Chuang Tze]
One day about sunset, Zhuangzi dozed off and dreamed that he turned into a butterfly.
He flapped his wings and sure enough he was a butterfly...
What a joyful feeling as he fluttered about, he completely forgot that he was Zhuangzi.
Soon though, he realized that that proud butterfly was really Zhuangzi who dreamed he was a butterfly, or was it a butterfly who dreamed he was Zhuangzi!
Maybe Zhuangzi was the butterfly, and maybe the butterfly was Zhungzi?