Who doesn't wanna get a second chance and correct our mistake in the past. I guess it's just happened in the novel though. So in these novel, our MCs get a second chance to go back to the past after their (mostly tragic) death. There are MCs that focus on getting revenge. There are also MCs that want to avoid trouble and choose to live a happy life. Whatever their choices, they make sure that this time, they don't make any mistake.