*SPOILER* Why does it seem like everyone’s gotten over this one thing in Queen of Tears?

Despite the happy ending, it does not sit right with me how Hyun Woo was glad that Hae In was dying and saw it as a way out. I get he wasn’t happy in the marriage, but feeling good about the possibility of anyone, let alone his own wife, dying from a brain tumour?? Is literally INSANE. Maybe it’s just me, but I’ve not seen people mention this enough. I feel like it’s been swept under the rug like sorry I personally can’t get over it 😭