A letter from China. Who could it be?

Wondering who in China could have sent me a letter. Was puzzling over it from seeing it emerge in the letter box all the way upstairs until I got a chance to open it. For a while, I wonder if it was from my late father's younger brother, but it wasn't possible since he didn't have my name and address in English.

Turns out that it was from a friend whose family is in China.