Brenner Souka's past is marked by a lot of pain and suffering. He was born into a dysfunctional family after his mother's death, and his older brother was more popular and handsome, leading a loving relationship with the girl Brenner loved.
He was respected by his father, who blamed Brenner for his mother's death. This rejection and the pain of having the love of his life pushed away from him pushed Brenner over the edge. He felt a deep anger and despair that drove him to terrible action.
In a fit of rage, Brenner killed his own father and his brother's girlfriend, whom he had such an aversion to. Furthermore, he burned his brother's face, leaving him seriously disfigured.
Thus, Brenner Souka became a fugitive from justice, seeking to hide in every possible way. Eventually, he entered the criminal world and formed his gang, using his pain as fuel and his anger as a weapon to achieve his inhuman goals.