Both deals with relationships, family problems and friendship. They have similar vibe and you can easily understand characters because they have problems like we, ordinary people have. Also I feel like they are both healing dramas, if you know what i mean:-).
Both are romantic comedies with puppy like romance. FL in these dramas are kind, sweet and responsible and ML in both dramas are sooo cute. <3
Both are romantic comedies with unique FL and FL is surrounded by cute (hot) boys. Sungkyunkwan Scandal is a historical drama but it is easy to watch and you won't be bored even for a minute.
Both deals with corruption and they have dark vibes. Both are not romances but they have platonic relationships. And in both stars Jang Ki Yong ;-).