Kind female lead who doesn't get along with the main guy at first; they meet again years later.

In both dramas, two figures from the ancient times time travel to the modern times.

Both are about a guy who loses his first love and becomes a vampire. The difference is that in Love in Time, the main story takes place in modern times.

In both dramas, the protagonist hides his real identity from the girl he loves.

both dramas involve the main female character playing as a beautiful heiress and also as a nanny. Also, the main female character loses her memory in both dramas. Enjoy :)