Time travelling Female Lead in both dramas. She's also very peculiar in both, though for different reasons, so the character is funny and kind of relatable. Same for the other main character, they are unusual and not your typical male leads in both show which makes an original storyline and weird situations.
Both shows revolve around different families and their relationships and feature multiple couples. Lots of family secrets to reveal in both dramas. They also focus on the relationship between parents and children.