Based on how the ML has been forcefully getting some guiding from the MC without realising that it was basically grape and how much it hurt the MC with no lube or even stretching at all. Tells us its standard practice with Guides who were born and trained since childhood. And basically mutant Guides are normal people who know how sex really is and how it's not supposed to hurt and would likely protest and could get the other guides to rebel when they realize they have been brainwashed into accepting abuse and they don't want anything that is unstable or disobedient. Hence why the ML hid the fact he could not eat or sleep in his childhood so he would not be killed off as well. Also I remember the mentioning it was a waste of time training mutants

Can someone explain to me why a mutant guide is bad again? Because at first we learned from Wui Wui that they’ll killed any mutants guides at first no questions ask but now like the higher up want to capture Kwon Jaejin? And kill him if necessary… I guess I get that part (●'◡'●)ノ but like what makes a mutant bad? I’m trying to understand that part because I’m getting kinda lost ┗( T﹏T )┛