The blonde one had the affair. I think initially the uncle was trying to save Horang but maybe his own recklessness and greed took over thinking Horang is now set for life. Horang's Dad is probably an omega since they used the word heat instead of rut ,although in some stories they use heat for both the omega and alpha ,and I'm not sure about the fated pair existing in this universe but pheromone compatibility exists . Hope this helps

Ok i'm confused.
Which of Ahjo's dads had the affair?
So his uncle was really just using him the whole time? He took Ahjo's money and ran?
So Horang's dad was attacked by someone and then was put in jail for self defense? Horang's dad is an omega, right?
R fated pairs a thing in this universe?