Both dramas have a FL traveling from the present/future to a past historical times. Both MLs are poisoned and can be cured by the FL.

Both dramas feature time travel between modern day and a historical time. Both FLs are doctors.
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Both are short length dramas with a modern day FL who travels to a historical time, and a poisoned prince as the ML. There are "game" like/VR elements. Both dramas are very similar and appear to take place in the same "universe".

Both dramas have a similar feel and tone, with one or both of the leads have experienced a past trauma that leaves one of them with an unusual medical condition which they believe can be eased/cured by the other. Both have a love triangle between the couple and the ML's brother who is a half or adopted sibling and has a talent (singer vs. painter).

Both FLs are cute, MLs are their rich bosses. Both MLs have a past trauma.
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Both dramas have a plucky, endearing FL and a rich ML with trauma. Both have a love triangle between the two and his brother.

Both MLs are overbearing CEOs with past trauma, FLs are quirky and endearing. There is a manipulative SFL trying to destroy the couple.

While one is fantasy and the other is not, both have MLs are cold, overbearing CEO with a part trauma and both FLs are cute and endearing.

In both, the ML is a cold CEO whose past trauma has left him with an unusual medical condition. The FL is the key to curing his condition, so he keeps her close, only to fall for her. Both FLs saved the MLs after a car accident but neither ML can remember their face. There is a manipulative SFL determined to break the couple apart. While one drama is fantasy and the other is not, both have a similar feel and tone.

Both are light dramas about a romance between an alien with special powers and a human.
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Both have a romance between an alien and a human but the genders are flipped. Both feature amnesia in some way (ML in MGIAA has an odd sort of recurring amnesia, and the FL in TEOEL forgets about the ML). Both aliens have some special power(s) that they use to help the human.

In both, the FL is lonely and the ML is an AI attached to a piece of technology (phone vs. glasses) who becomes her friend.