Comment by Yozizi on Thanks to My Childhood Friend, I Became a Top Guide - Chapter 30

Ok so from what I can gather, just like recap, both of the twins are sons of two s classes, so they wanted, or it seems like their dad really wanted, them to be a classes too, so now they are trying to make their youngest son try out this new trial that makes his class develop early, turns out if the twins had developed as s class then the youngest probably wouldn't have been born since the parents just want an s class kid.
Anyways 
The white haired dude, the guide, for some reason was stating with the twins and their parents for a few years. Doesn't really explain why though, but seems like the twins dad doesn't really treat or like the white haired dude very much and so he decided to leave instead of staying in that fake household. The twins, mainly the red haired dude who is blonde in the flashbacks, is really clingy towards the MC and though the other twin blames it on twin shared feelings, but he is also getting kinda clingy with mc, and how both are sorta obsessed with him.