Both shows portray the advantages one has when born into wealthy family and how those young chaebols often take it for granted the opportunities they received. It also show regular young people becoming successful despite their low background and depicts friendship between the two classes.
both are quite realistic especially considering how they reach their endings. it is just life being messy and complicated. how timing and the level of understanding one another in a relationship can affect it in many ways.
Both dramas have a strong focus on the entertainment world, its good and bad sides, as well as human relationships. Both stories have a slice of life vibe.