I don't agree with you. Joohyun still killed his teacher. The one who took care of him for years. And no, it was not for Hawn but only for his survival. At that moment you understand what kind of person he is. The worst I will say is when he felt reassured that Haw'ns father and brother were dead! It's hyper calculating and selfish. They could have had a great story together but it's not Hawn's fault. Joohyun was too selfish even if he regretted it.
But I feel sorry for him of course but well ...
Yes i agree with you. Joohyun was greedy. Tho he wanted to saves hwan, he killed all of his family. Hwan rather die than his people died. He's selfish when he was feeling glad others died so hwan could be safe. I know he regretted but you can't fix everything just a sorry. Both hwan and sooin has been betrayed by their man so now i just wish they to will have a happy ending now. They deserve each other

I said it before and I'll say it again. In my opinion Joohyun didn't deserve this and the way he became is also thanks to Chi-hwan. And the fact that Chi-hwan never even realized it, is rly frustraiting. I understand that Joohyun did bad decisions (like when he got their 'family' killed) but Chi-hwan also did some. It's normal for humans to try and save themselves and their significant other first and it's nothing new, so the way Joohyun is now is thanks to Chi-hwan and how exactly he decided to punish him. Joohyun DOES regret his actions and he clearly still wants things to be the same they were at the beginning, but he just got so sour over these years of being in constant pain and frustration, that he just does things the bad way. The way Chi-hwan sees him as a whole from that day.