@megagen
At some point you'd have to blame society for letting this happen. This woman was going through postpartum depression and had to carry herself to take care of duties on her own while her husband was going to war and going through loss of precious family. She's expected to do all these duties of a wife and had no time at all to just stop and address her own feelings that are crashing down.
She couldn't even be with her father to the end even though she wanted to. She wanted to love her child, but she couldn't. She desperately needed therapy but with that sort of historical society, you have no support for mental illness. Even now with our understanding of mental illness you would be lucky to find a good therapist depending on where you live in modern times.
This isn't an easy black and white situation. She's not a monster. She's just going along with the flow trying to tell herself she's happy and truly to make herself happy when she's really not and she's not getting the help she needs.
She regrets, she's trying to change and do better with this second chance all while trying her best to heal.
I think this manhwa is portraying something that doesn't get shown enough and people don't seem to understand as much that postpartum depression is very real and it happens and things need to be done to address it.
Edit: Also in case you're wondering, when you lose a loved one, especially one you're close to, it changes everything. You don't become happy again after a month or whatever. The guilt eats at you every single day, you wonder what could have been done, etc. You become angry, sad, and all kinds of complex emotions and yet you can't let these feelings out because other people don't actually care, they just want to see that you're able to live and that you're "happy." I know this quite well.