An app appears on his phone that shouldn't exist. It opens doors into stories he has already read — a dungeon-conquest serial, a murim epic, whatever happens to be next on the list — and drops him inside with every advantage the original protagonist had to earn. The heroines are all there, exactly as written. So are the men they were written to end up with. He clears one world, the app queues the next, and nothing he does inside it follows the plot it was supposed to.