A mob boss, also referred to as a crime boss, is the leader and chief decision-maker of a criminal organization. This individual presides over the business as its head. This is the textbook definition.

Or, for simplicity, you could just say Christopher Bang.

A man of many faces, Christopher's identity ranged from gentlemanly and kind, to cold-blooded, intimidating, and ruthless. In the criminal world, he was known and feared by any who had the misfortune of crossing his path. Despite his cutthroat exterior, his top priority was his family. He would do whatever was necessary to ensure the safety of his seven closest members. The second-in-command, Minho; and his men, Changbin, Hyunjin, Jisung, Felix, Seungmin, and Jeongin. With these members, he had no need for anyone outside of business partners.

...Until you came along.