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?
Similarly, of the two following stars after the Great Yin Star and the Great Yang Star, the Elusive Ghost Star suited him more as well. It was a technique about being elusive and hiding away, as well as more of an escape technique due to the ability to shift or choose between two possible locations at more advanced levels of usage.
Going beyond the literal usage of the technique, the 'feel' of the Elusive Ghost Star also suited him better. As someone who felt ordinary and mundane his entire life, to say he was invisible was a bit much, but he certainly wasn't a 'main character' or anything of the sort in life. As a bystander, he would watch on for a few moments before moving on with his life, and later when someone recalled the events of the day, even if he had been there, few people would remember it.
Thus, every night he had been meditating on the Elusive Ghost Star, which was a star that was… invisible.