I agree with you that there are some things in life from which you can’t return and rape is one of them. And if it were the only sin in the story, I would have shared your opinion. However there are more factors to the end result and the final mental state of the characters. They are at a point of no return and, as the main character expressed at one point, if they can’t go back, where should they turn. !SPOILER! (To who hasn’t read until the last chapter)
Going forward and ignoring the past is not an option. That’s why I think the burning of the warehouse, which represented the symbolic erasing of the past, is a way of starting from the beginning. Both characters are at fault for what has happened until now. Now I’m not saying D. (I don’t know how to spell his name properly) deserved the rape and abuse, that has happened to him. He played a role however in setting the factors, which led to this situation. And since both of the characters are at the same time villains and heroes, there isn’t a sure ending and retaliation for them. As we have seen neither of them wants the other one to die, they can’t just pretend like it hasn’t happened either. D. has nothing to go back to and because of his early on abuse craves for affection and love. The other one can’t live without D. because of his obsession and also has nowhere to go. This is why in my opinion the only way to go is to start over. In conclusion, is it a happy ending - no, but it is a fitting one, in my opinion.
Interesting perspective. I can appreciate your point of view and I certainly understand that it isn't a clear black and white kind of situation. There are complexities that make it hard to feel strongly one way or another. No doubt they've both made mistakes. I just feel one has made an unforgivable mistake. If I were in Dohyun's shoes I couldn't learn to love the man who raped me. Anyway, thanks for being respectful! I enjoyed reading your feedback.

Honestly... I don't think this story should have a happy ending, or at least not one in which these two walk away a happy couple. Realistically, once you rape someone there is no hope of a healthy, loving relationship. You can't come back from that... to me it's the ultimate sin and breach of trust. If this story pulls the "Oh, I forgive you so let's live happily ever after now" card I won't feel comfortable. I feel strongly that we should never romanticize rape or minimize it as a crime... even if it's a fictional story. This story's realistic portrayal of rape thus far was the only thing I could stand behind... Does anyone else agree? I know not everyone will.. and If not, I'd love to hear your opinions so long as they are respectful.