Your opinion (Spoiler)
Why do you think the husband gave her a ride to prison the last time she went to see him?
Was it out of guilt? Or did he think it would bring closure for both his wife and the inmate?
Also an interesting thought, flashback when the husband said, "If you go, I don't know what'll I'll do. You want to see me go crazy?" Then fast forward to the news when the news reporter talks about Jang Jin killing his wife and two daughters. Just thought I might share.