After the heavy snowfall, only Nangong Xun was missing. However, there was a poem left in the sea of snow, which said:
"I was not born before you were born, but you were already old when you were born.
I am far away from you, but you are separated from me by the corner of the ocean.
I was not born before you were born, but I was already old when you were born.
It turns into a butterfly to look for flowers, and roosts on fragrant grass every night.
Only half of the poem is left, with a tail and no beginning. The world is too lazy to find out.
Intention: