I Became a Dead Character in a Prison for Wastes

I got transmigrated into a book, but—excuse me, what?! What am I supposed to do when I transmigrate ten years before the original story even starts? The setting: prison. The problem: it's worse than the jungle. A lawless war zone. After rolling through hell for ten years, I became... The leader of the prison. "Hey, Mint. You might wanna chill." "I'm afraid I don't know what you're talking about, sir." I ended up a swaggering prison gang leader. But hey, I'm fine with this. This is what we call the privilege of a long-time survivor. "On paper, you'll be considered dead. In return, you'll do a job for me." "I'm afraid I still don't understand, sir." Then a chance came—like a lie made real. "Help me, and I'll get you released." "What do you need, Master?" "..." The prison chief gave an order to me—now known as the prison's #1 certified nutcase: "Turn the new guy into the boss of this prison." They call it prison, but this place is a total free-for-all. And if I manage to crown one man as the next boss, I finally get out. "But the place you're going to... is the men's prison." "...Huh? I don't exactly have the thing for that?" "Disguise. Got it? Disguise!" ...Except—oops? Turns out that new recruit? He's the original male lead.

I was reincarnated into this novel… Wait, no! I was reincarnated 10 years before the events of the novel took place? The setting of the novel is a prison that’s even worse than hell itself. This and that happened, and ten years flew by. I’m now the top dog of this prison. * “Hey, Mint. I’ve got a job for you. Get working.” “You’re saying all this stuff, but I don’t know what you mean.” Despite being the top dog, I pretend to be an idiot. But I’m fine with that. It’s one of the plus sides of being dead. “Pretend to be dead on paper. In exchange, I’ll do something for you.” “I don’t know what you’re talking about.” Then an opportunity crept up like a sweet, sweet lie. “If you help me, I’ll release you from this prison.” “What shall I do for you, Master?” “….” With those words, the prison warden was able to order around the prison idiot. “There’s a new inmate that’s being brought in. Make him the new top dog of the prison.” This place is called a prison, but within these walls is total anarchy. As long as I can make this guy the new top dog, I’ll be free of this place at last. “But you’re going to have to go over to the men’s prison.” “…Eh? Do you really think I’ve got the parts for the job?” “You’ll be in disguise, a disguise!” But alas! The new inmate is the male lead of the novel.