Who is the "old friend" in the poem "Until you came to me in your dream last night"

Li Bai. Describing Du Fu's psychology when he dreamed of Li Bai for the first time shows his concern for the good or ill luck of his old friend.

Li Bai's Dream by Du Fu, a poet in the prosperous Tang Dynasty.

When death is the reason for parting, people will cry, but life leaves again and again.

You didn't bring me any signs of exile in the poisonous humidity of the southern river.

Until you appeared in my dream last night, because I have been thinking about you.

However, how can you raise your wings and use them from the middle net of your net? .

I doubt it's really you, venturing a long way.

The soul comes to the maple leaf, and you disappear into a vague castle.

I woke up, and the low moon flashed on the rafters, as if it were your face, still floating in the air.

There is water to pass through. They are wild. If you fall, there will be dragons and monsters in the river.