Assassin Training System, Kill Through the Wasteland

[System + decisive killing + multiple female protagonists] After Nie Zheng traveled through time, a voice echoed in his mind from time to time - 'Forget me' This is a wasteland world after a nuclear war. All creatures are mutants, and a few have special "super-source" abilities. The surviving humans built a hundred-meter-high wall to surround Green Island. The high wall marked the boundary between Green Island and the wilderness, and also separated the gap between the wall dwellers and the Green Islanders. Separated by a wall. Green Island is full of high-rise buildings and the wilderness is full of dangers. It's not just the wild radiation beasts that eat people, but also the insatiable human heart. Nie Zheng activates the [Assassin Development System] and becomes stronger by doing things like an assassin. The promise made by the Green Island people turned out to be a lie, and the sister got involved in a deeper conspiracy whirlpool. If there is no way out in a desperate situation, then fight your way out! The world is sick, and assassins are the best doctors. After cleaning up the filth. The truth about the voice in my head gradually emerged.