While I agree to an extent, comparing Carcel's of tragedy and neglect to Ines' r*pe, torture, and outright abuse not to mention how many she's been killed/died isn't exactly fair. Ines bears the burden of all the trauma of her past lives and is constantly on edge while also trying to maintain stoic so no one messes with her plans of freedom. I agree that these readers wrongfully dismiss Carcel however to compare their pain is unjust for both characters. Rather it's about understanding and accepting that the characters are healing and working through it together just like you said, that's what the readers should focus on.
I don’t disagree with you. Having read the novel I know all the details of Ines’s sufferings. What I think is immature is trying to dismiss a person’s pain because somebody else had it worse. I also do not agree with dismissing the wrong a person did to someone else because of their own pain or reasoning. Ines didn’t dismiss the pain she saw in Carcel’s eyes when they discussed her original intention. Her heart broke when she saw he knew and never said anything. She didn’t think it was okay to shove her original intention under the rug. She confessed it because she wanted to come clean and be fair to him. She even tried to tell him she would abide by the decision he makes.
It’s the same with Carcel. Even though Ines didn’t care two straws about his lifestyle before marriage and still doesn’t care, he still apologized to her several times about it to the point where she gets annoyed. However, Carcel does this as an admission that he was wrong. This couple confesses their faults and grow stronger each time.

I’m so tired of some readers claiming to like or enjoy Carcel while diminishing and disregarding any hurt or pain he might feel. Most of the times they don’t even realize what they write reveals what they truly think. I can defend Ines’s behavior about the way she treated Carcel without devolving into the weak statement that it’s okay that she treated Carcel bad because of everything she has been through, which, by the way, has NOTHING to do with Carcel.
In fact, even before the manhwa launched, novel readers discussed Ines and Carcel’s flaws. (Yes, they both have flaws. We never shy away from the truth that Carcel slept with others before marriage or that Ines dubconed the painter. Both are true and controversial flaws) We don’t dismiss or diminish Ines’s pain nor Carcel’s pain. We don’t have the mindset that a healthy child’s pain should somehow be dismissed because the sick child’s pain is worse. No one’s pain should be disregarded because another person had it worse than them. Every one’s pain is their own. It’s also never okay to hurt people that never hurt you in the first place.
Lastly, the manhwa has reached the point that has shown us both Ines and Carcel are working through past and present issues. Carcel has acknowledged his wrongs and Ines has also acknowledged hers. Ines didn’t dismiss the hurt she saw in Carcel’s eyes after she confessed to him she married him to use him and dump in. In fact, in the novel (manhwa discarded this), Ines finally broke down crying when she realizes this. In her thoughts she even said that she probably already broke Carcel before when she thought of the memories she’s been getting from the first true timeline.
It’s the same with Carcel. He never dismisses Ines’s pain even before knowing anything about her past. He has always, always cared about her happiness, life and health. Those who actually understand both characters and how they regard each other’s pain would not be out here writing that one character’s pain doesn’t matter because the other had it worst. If this was the point of view in the novel then absolutely no one else’s pain should move Ines.