The Blessed Bride (2022)

Both are short length dramas that have a wedding in ep 1 and an assassin FL. While TBB appears to be much more comedic than TKIAR, I think they have a similar plot or vibe.

Both are short length dramas with an assassin FL.
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Both are mini dramas with a spy FL.
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Both are mini dramas with an assassin FL.
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Both are historical mini dramas in which the assassin FL infiltrates the ML's home in order to kill him, but the two fall in love.

Both are historical mini dramas with a FL who is an assassin after the ML at the beginning. The two then fall in love.

Both are historical mini dramas in which the FLs are assassins sent to kill the ML who become romantically involved with him instead.

Both are mini dramas with a spy FL.
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Both are mini dramas. The female lead wants to get revenge on the male lead by killing him. The female lead then falls in love with the male lead. The female lead has a secret identity in both dramas. The male lead is actually protecting the female lead.