In both dramas, the main character travels back in time and becomes a servant, then falls in love with an aristocrat man in the past.
Both dramas revolve around the main leads already in a relationship where one of them gets into an accident and loses their memory. Then the other has to take care of them.
Both involves the plot of reunited best friends from school with one of them avoiding the other due to a past crush.
Similarly, there's a love story between an owner and a dog who turns into a human. The owner and the dog first have a close relationship as pet and owner, but when the dog becomes a human, their relationship evolves.
In both dramas, the plot follows the main character many years later returning to the past and trying to change the fate of their first love who has died.
