Butterfly's dream.
"One day, a man named Jang Ja dreamed that he became a butterfly.
I loved flying around, so when I woke up, I had this suspicion.
"Did I become a butterfly in my dream as a human being?" Or
Did I become a butterfly in my dream?"
This is Jang Ja's “The butterfly's dream,” which is often cited in modern times.
Whether it's a human or a butterfly, it doesn't matter at all.
It's a dream! A dream!!! only you need to wake up! That's all.