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?
Deducing The Truth From Doubts
The best the old gentleman could do was weed out the poor liars who had loopholes in their methods and make guesswork on the rest. But regarding the safety of the Academy, he couldn't rely on his guesswork alone, that was just asking for a disaster. So after thinking for a long while and considering what he did know of the Academy's resources, he made a very simple system.
He would 'trust' people.
He couldn't stop people from lying, but what he could do, was give a 'mark' to everyone who came by announcing their cultivation to be above a certain stage.