Both short stories that center around a ghost & a non-ghost...................................................................................
Drama Special Season 6: What Is the Ghost Doing? (2015)
Related
Both feature a female lead ghost. The drama special is shorter & has more chemistry between leads than Delivery Man. Also Drama Special free on YouTube = https://www.youtube.com/watch?v=n22E0wEROOk
In both specials there are female ghosts who haunt a man until secrets are revealed.