The main argument and conflict is the use of a tool to measure people "value".
Main character object the premise, from a moral high ground.
Soon comes the revelation, the m.c, have a "hidden" skill that allows him to spy the hidden skills, and therefore evaluate those around him.
Basically...
You know? it made sense for me but somehow don't agree completely.
Im have no proof nor doubt that the first use of visual imagery for communication, it was body and face painting.
It believe that predates even any form of clothing, since just the byproducts of eating and salivation, can...
I dont know what is worst: my obsesive compulsive shit of a brain, the person that post 356 "spoilers" tag just to give us the finger, the fact that I made it to the end, or that was more time consuming that reading the chapter of this manga