Both dramas are about con artists that are trying to swindle money from the female lead but end up falling in love with her instead.
Both male leads went to prison when they were innocent and both seek a heiress to get their revenge.
Both are revenge-based dramas in which the male lead is wrongly charged with murder and returns several years later with more power and tries to ruin his accusers. Both have strong female leads who are determined and can handle themselves without the help of a man. Both these dramas are melos and have a really sweet feeling and can get you sucked into the life of the characters immediately and of course.. both are very enjoyable. Although I must say that I prefered Beyond the Clouds more than I liked Goodbye Mr. Black.