The Legendary Janitor
Most people don't choose reincarnation. Reincarnation finds their way to them. Perhaps they did something great in their life. Or maybe truck-sama wasn't looking where it was going. But without fail, those who reincarnate are destined for something great. A new life where everything changes for the better. But... Reincarnation isn't always the greatest thing. Sometimes you just draw the short end of the stick. Di Tou just happens to have drawn the shortest stick. Pulled out of his life randomly. Taken by a crazy old eccentric man not as a disciple, but as a body double?! And a janitor body double no less?! Grasping a system to find... It's a JANITOR SYSTEM!? Truly, how unlucky can one get?
A Chance To Stop a World War
Going back to the metaphor of the president and the launch codes. In this situation, Di Tou was never the president at all! In fact, he was just a little general in charge of a nuclear submarine. Due to interference and the situation at hand he was effectively 'blind.' He didn't know the situation at all and could only act on his best judgment. He only knew that before he submerged the situation was dire and world war might break out at any moment. If that was the case, there was a chance that his country had fallen and he and his mates might end up being the crucial factor that could win or lose the war.
Hundreds if not thousands of miles away, the 'president' Mu Di Bai naturally had a plan, as long as things went smoothly, not to mention a nuclear war, perhaps even peace could be achieved! As long as things went smoothly and according to his devices, everything would be fine.