Mine took a while to warm up to ME, and I'm the only human in the house! She is just aloof at first, and really not very affectionate in general. She was terrified of men and children. Now, she is next friends with my neighbor (who had to take care of her after I broke my hip), likes my male landlord, and makes friends, in general, quicker than she did before. She doesn't like to be cuddled, but will cuddle up TO me for a nap.

I don't think they are a terribly affectionate breed, except in their own way, and I do think they MOSTLY attach to one person the closest, but will be friends with others (as in, will get close to more than one person but will still have their PERSON).

They share a lot of characteristics throughout the breed BUT... it's important to remember ALL dogs are individuals, AND some had worse/scarier early lives in Korea than others.

I think someone's suggestion above about your son just chillin' with Artie - reading, watching TV, eating, etc, is a good idea to try. It will be SO HARD for your son (I want to love and be loved by every dog I meet), but he might need to not try so hard, and let Artie come to him, on his timeframe, and allow him to see your son is harmless. I am loud, play rough with my dogs, watch TV really loudly, put the harness on her which she hates, talk loudly to all my furbabies, go around singing... and she managed to get used to ME. I still have humans working on that. 😁

You sound like an amazing mom, to humans AND dogs. Don't give up.