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?
So Mystical!?
Endless perseverance. Like how an ordinary person, a mediocre person, would spend their entire lives slaving away for a slightly better life, perhaps to no avail, but they would try. When they failed, their kid would try. Generation after generation each would hope to be better then the last, as as long as they kept improving they would eventually be able to reach the splendor and glory they desired a hundred and one lives ago!