Villain Design, Protagonist Script

There is no inedia setting in this book "A group portrait, no heroine, no routine, no system, not a cool novel." [The protagonist is very violent. He kills his mother, his brother, and his friends without mercy. He just wants to survive.] ———— Chaos, fighting, and disorder are the norm in this world. Until 15 years ago, people found the savior. Legend has it that he will end all strife and bring peace and hope to the world. Fifteen years later, a villain emerged, and his sword cut off all hope of the human race. When people were hopeful that the savior would kill the biggest villain and bring peace to the world, they were surprised to find that the villain was their savior.