This could be used to describe the cast

CHO KYU HYUN- son of a wealthy man who forced to take up law course....despite his opposed on it he rather thanked his parents for him to take the said course and send to seoul universiy, he is thankful for meeting his precious one... his family owned a big businesses.... his parents involved in triad. The powerful business man in the country and partners globaly, even if it is illegal that involves assassinations...

LEE DONG HAE- rich but not as wealthy as kyuhyun .....they own small businesses...he is teh reason for kyuhyun in thanking his parents....they were in a relationship fpr only just months.....accepted by his boyfriend family....shy person....study photography in seoul university....likes travelling just to take photos.

LEE HYUK JAE- the man who doesn't know how to be happy...good at fighting....gun is his twin....fierce and sharp look is what you can get from him..... cold personality,,,,adopted by cho family,,,,,

YESUNG and RYEOWOOK- friend of the kyuhae couple

HEECHUL- Hyukjae's right hand and bestfriend

SiWON - younger than hyukjae and heechul but  tend to be their best friend too... three of them were partners in every project....