emeraldarrows

Both dramas have a school setting, a similar tone and pacing, and a frenemies/semi-antagonistic relationship between the leads that gives way to friendship and eventually romance.

Both are school setting dramas with a very cold seeming ML who secretly loves the FL and an endearing FL.

Both are a school setting with an initially antagonist relationship between the leads that eventually becomes friendship and then a gentle romance. Both have cute and perky FLs and cold outside but warm inside MLs.

Both are a school setting love story with similar pacing.
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In both, the FL sees ghosts constantly which has caused her to be reclusive, eccentric, and shut herself off from other people. At some point in the drama (all vs. one scene) the ML appears as a ghost but is not really dead, but the FL thinks he is dead at first. Both dramas have a very similar feel (Ghostderella is basically a condensed, shortened version).

Both are short dramas with a FL who sees ghosts and a ML who is either supernatural or has supernatural powers who can help her.

ML vs. FL sees ghosts and lives with ghosts who participate in his/her life and basically are like family.

Both dramas feature a FL who sees ghosts and lives with at least one, who is closed off to the outside world until the arrival of the ML who is supernatural or has supernatural abilities.

Both are short dramas with a ghost-seeing FL. The ghost ML vs. SML is not truly dead (yet) but is thought to be by the FL.

Both are short dramas with a very light horror tinge. In both the FL can see ghost(s).
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Both dramas have a richer ML/less well to do FL. The two have a childhood connection and shared trauma but don't realize it until much later on. The main couple ends up living together and fall in love.

The main couple have a childhood connection they don't realize/remember, the ML (or both) have suffered some trauma in their childhood. FL is employed by the ML/his family which requires them to live together and leads to them falling in love. ML's closest family (mother vs. grandmother) is determined to see him married and over-involved in trying to get the main couple together. Both dramas have similar pacing and feel. Also, the SML actor in PL is the ML of TTFIL.