My other comment:
My theory is that Aaron and yujin met when they were kids. There's a flashback yujin has where he sees a boy with blonde hair and thinks something like "rich kids" and there's a scene where Aaron has a memory of a boy with black hair. I think it's safe to say, and as a pretty typical trope, they knew eachother when they were young. Also I'm the first or second chapter Aaron tells Yujin that he knows he used to want to be a singer.
I also think that yujin saved Aaron from yujins dad when he was younger. In the first few chapters when they are in that gun room Aaron says it's because he was shot at when he was younger and he has them to protect himself. He says that yujin looks like the guy who shot at him. In a chapter shortly after there's a scene of a man with black hair watching Aaron and yujin on the TV in a prison uniform. There's also a bit when yujin is sleeping where he says "sorry dad" or smth like that. Yujin also often hints at having a good life before something happened like how Santa "stopped coming".
I think Yujins dad kidnapped Aaron for money or something since he probably couldn't afford Christmas presents and Yujin helped Aaron escape. He then got his dad arrested but doesn't know that Aaron was the one he helped. However, Aaron knows which is why he gets comforted by his voice. Maybe it's because Yujin would sing to him before he helped him escape? This could also be why Aaron knew Yujin wanted to be a singer when he was younger. This is also just a theory btw
yeeess this makes sense, aaron probably knew who yujin was all along and that's why he wants his "prey" to not runaway
Yujins last name is Hart, and since Aaron is looking into Harts release that means that Yujins abusive dad is out of jail. We did see Yujins dad talking in the previous chapter and I stand by my previous comment about Yujins dad being the one that kidnapped Aaron because Aaron tells Yujin how his face reminds him of the guy who "hunted" him all those years ago. Yujins mentioning in this chapter that when he was young he saw Aaron's face a lot hints at a previous chapter where Yujin has a memory of a young Aaron but could also be a reference to how Yujins dad watched Aaron a lot so he could kidnap him. I also stand by my belief that the reason Aaron is comforted so much by Yujins singing, is because Yujin would sing for him when he was held captive . Yujins doesn't like to sing because he was probably used for his voice by his dad. I have way more evidence on this but I've forgotten it all. I do though remember Yujin mentioning how he stopped getting Christmas presents? I also remember having a good reason to believe that Yujin was the reason his dad got arrested. I can't remember but for everyone who's reading for the plot as well as how hot Yujin is I'll find my comment and paste it in my replies