Kim Hongjoong, publicly known as Edward Kim, was a well-known and wanted criminal in Korea. He was known for his various crimes. From theft, to drug smuggling and murder.
He was their leader. Ruthless, careless, reckless, yet loved his members deeply. It was contradicting, how his brain was wired. They never went out together during their operations in order not to bring attention. The eight men often met at night in an abandoned warehouse.
They weren't exactly a 'mafia gang', more like a bunch of young, adventurous friends who wanted to rebel and play with the government's rules, thinking of rules as nothing but things that were meant to be broken.
Despite all of that chaos, he had his private life, and had a best friend of seven years who knew everything about him, even his crimes, yet never participated in them.