It's Just Not Sure That It Matters (2021)

Both are mini dramas in which the leads love story ended tragically in the past and one of the leads has been waiting centuries for his love to reincarnate and get their happily ever after. However when he finds them, they are very different (different gender vs. completely different personality).

Both are mini dramas that involve a pair of lovers whose story ended tragically in history. Now they are reincarnated and reunited in present day, but one has a completely different personality.

Both are dramas that involve a pair of lovers whose story ended tragically in history. Now they are reincarnated and reunited in present day, but one has a completely different personality.

Both MLs are mythical beings who has spent centuries waiting for their true love who died tragically for them to reincarnate and return. When he finally finds her, she has no memories and a different personality.

Both MLs are demons and were/are in a forbidden relationship with the FL. Both involve tragic pasts and reincarnation. Both FLs are cold/heartless.