Both are short dramas about the FL caught up in a situation involving ghosts and meeting the ML who helps her.

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.

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.

In both, the ML is slowly losing himself to another personality/being within him, and the FL is determined to save him.

Both are historical dramas with fantasy worldbuilding and elements. Both have a similar feel despite very different plots.

Both are quirky, fun, and unique short dramas in a school setting. Both have fourth-wall-breaking elements (the actors and characters have the same names, and CYH lets the viewer choose the ending), and light fantasy elements (the "ghost" of a coma patient as a character vs. the "inner personality" of the FL as a character).

Fluffy, cute, and quirky dramas in a school setting. The FL is extraverted and somewhat awkward, ML is somewhat aloof/distant. FL chases the ML first.

Fluffy, sweet romances in a school setting.
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Frenemies to romance. Both are school set and light in tone youth dramas.
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Childhood friends to romance within a circle of friends/schoolmates. School setting. Both are sweet and mostly light youth dramas.

School setting, sweet light romance.
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The ML is an android or similar like creation of a scientist, and falls in love with the human FL. Both MLs sacrifice themselves but return for a happy ending after a while.