Bang Yongguk was born into a family of Masters and Slaves. His father was a Master whom use to work for Elison's father. His mother was a Slave from this very house. His father was known to own many Slaves. Yongguk does not have any blood brothers other than his twin Yongnam. One of his fathers Slaves had a son before he came to Guk's fathers. This son's name was Yoo Youngjae. Growing up together Guk always spent a lot of time with Jae. When they were younger, Guk was 10 and Jae was 8, they where out playing Basketball when Yongguk seriously injured Jae's ankle. Still to this day he walks with a limp. Yongguk feels really guilty about, so when he turned 19 he bought Youngjae. He wanted to give a the Slave a good life. He never meant to fall in love with, they were just friend. But he couldn't stop himself. He realized after all these years he was so madly in love with his best friends.