This scene of rape is shocking but I think it had to be present in the story because it is realistic, in all the prisons it is not this kind of terrible things. It's important to show the reality of prisons.
I also think that Jiwon has the right not to want a relationship based on love. People don't necessarily look for love when they have sex with someone. If it bothers and hurts DG as Jiwon says he just have to stop their relationship. You can't force people to love you.
Thank you for translating! This manga is gold.