Revert "Delete post-the_letter_bg.jpg"
Revert "Delete post-the_letter_bg.jpg"

This reverts commit a3ac05e7c7fb5ddb287e2d1c5021bd4e2837b62f.

StephenChan007/StephenChan007.github.io,StephenChan007/StephenChan007.github.io