Both dramas are about one of the leads suddenly dying and the other attempting through time travel to save their life.

Both FLs time travel to their school days in an effort to save someone.
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Both dramas are about one of the leads suddenly dying and the other time traveling back to the past in an effort to save their life.

Both dramas are about one of the leads suddenly dying and the other time traveling back to their school days in an effort to save their life.

Both FLs time travel back to their school days.
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Both FLs travel into the past to save the life of the ML.
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Both FLs time travel into the past and their school days in order to save the ML who appears to have committed suicide.

Both are Republican Era mini dramas in which the FL is a self aware character in a video game who accidentally gets transferred to another game and must set things back on track.

Both FLs enter a novel in which they are married to the royal ML who hates them and is destined to destroy them. The FLs attempt to escape upcoming events and the novel but in the process the two fall in love.

Both are xianxia mini dramas in which one of the leads is a reincarnation of a god and the other is a demon and both are together in a sect.

Both MLs have a magical object inside their bodies that belongs to the supernatural FL's people, and the FL is supposed to retrieve.

Both couples meet when the ML is still a prince, the FL then is assumed to have died and the ML becomes king, shifting into a harder personality. The two then meet again when the FL returns.