Did this nigga rape everybody INCLUDING the old ass man in that cell I’m done
After rereading half of the chapters, I figured both siblings represent one of their parents. Jingi looks like his dad and got his anger issues too. We can even see him giving money to their mom but still hurting her, same thing Jingi does with MC. It was also mentioned that their dad had many problems but never expressed them (having debt). In comparison, Jingi never tells people about what his uncle did, not even to his brother.
As for Heonjae, he takes after his mom. He upholds a lot of mental pain without losing his cool, but once he does lose it, someone's most likely dying or getting severely injured. Same way his mom maintained their dad's abuse but killed him when she couldn't anymore. It's also mentioned both him and his mom started speaking late, could again confirm they both had autism since it's already obvious on Heonjae + severe OCD for him.
My deduction is that Heonjae might kill Jingi the same way their mom did with their dad
I was looking forward for when this manga finally updates and now I wish I didn't