The Ghost Bride (2020)

gothic mysteries with a pair of leads who constantly bicker but also protect one another, and both dramas discuss the class differences between characters

Both are short(ish) dramas with a similar historical setting and horror vibes, as well as a very similar tone/aesthetic. Both have an immortal ML and a human FL pulled into a strange world of ghosts and monsters .

Both have a human lead who can see ghost(s).
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Both have a human lead who can see ghost(s).
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If you thought Gwi was wickedly attractive, then give The Ghost Bride a try (Lim Tian Ching there looks and gives me similar vibes to Gwi).

Both are fantasy romances involving an immortal guy who has a job that deals with spirits and a normal but strong-willed woman who are still dealing with past tragedies. Both dramas feel like fairytales and have elements of horror. The afterlife is an important feature in both as well. The Ghost Bride is shorter, while Tale of the Nine-Tailed has more action.

Ghosts and good chemistry between leads. There are a lot of little mysteries in A Korean Odyssey, whereas in The Ghost Bride there is one big mystery.

Both have a similar feel and tone, dealing with ghosts and folklore.
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Both dramas are historical, although different time periods, and horror/fantasy involving ghosts, gods, and other supernatural beings as well as locations. Both couples are antagonistic at first with a slow burn romance as the plot unfolds.

Both are short dramas with a very light horror tinge. In both the FL can see ghost(s).
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Both have supernatural elements and ancient male leads. as well as lots of humor to balance out the dark parts.

Both are about ghost marriages and involve horror elements in a historical setting.
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Both have a dark vibe and open with the concept of a "ghost marriage".
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While very different in plot, both dramas have a ghost-seeing FL and a "unique" ML (he can chase her ghosts away vs. he can help her because he isn't human). Both have horror elements and a slow-burn romance.

While different in setting and plot, both have horror. mystery, and romance as the genres and feature a ghost that haunts the FL because he loves her or wants to marry her.