I know everyone is saying that Hyun should prioritize Jaeha's injuries, which i think he did since he did ask what happened. Hyun was also frustrated, if you read from the beginning, you realize that Jaeha has been treating Hyun badly despite him trying to help and at this point i think, he feels like he still didnt get through to Jaeha and all jaeha ever wanted was kiwon and all the frustration just accumulated.
We understand that Jaeha treating Hyun badly was his own coping mechanism and partly Hyun's fault but, plsss people, Hyun is allowed to feel frustrated and helpless when he did so much for jaeha and was still treated badly only until recently. I feel sorry for hyun, i can feel his desperation more so than jaeha, its like he's holding on to something that always wants to slip away. Sighh muh babiesss