kyujin wasn’t isolating him, he actually thinks it’s good chiwoo is making friends & being overall more chatty. he just didn’t tell his friends they could visit him because he wanted to spend more time with him alone. had chiwoo asked to see them then that would be another story, but he didn’t so i don’t think there’s really any issue :)
most people in love want the person to themselves and to be with them all the time. its the honeymoon phase. lol but he doesnt stop him from being with others and seemed happy to see him making friends.
I'm pretty sure that if you were in the same situation you would do the same..
I kinda don't like how he also is lowkey isolating Chiwoo by not letting his friends join them. That's just me though.