Both these dramas have many things similar like male lead being arrogant, development of love between the leads, 3 boys and 1 girl staying together and caring for each other,etc...
Both stories have entirely different plots but they somewhat give you the same feeling...
You're beautiful is idol drama whereas rooftop prince is a historical and fantasy drama
While i was watching you're beautiful it made me laugh too much and at the same time cry also...i had the same feeling in Rooftop prince also