This is likely a specific internal file tag or a typo for a high-definition resolution (like 1080p) combined with a release group or site-specific encoding identifier.
: This likely indicates Episode 16 of the series in 480p resolution, formatted as a .mp4 file. download+nunadrama+the+best+thing+16480pmp+fixed
The Best Thing ( AI English ver.） Episode 1 - Drama - iQIYI This is likely a specific internal file tag
– Likely a misspelling of: