
Spoilers...
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Gyuwon ignores whether Hwayoung tries to kill him or not. He doesn't blame Hwayoung or try to judge his actions or make it make sense. He just says "Have you eaten". He's selfless and what matters most to him is what he can do for Hwayoung now. And this knocks Hwayoung out of his headspace of hurt and resentment and back into caring for each other. They both fucked up but doing what they can for each other now is what's important. I liked it better.

He says "let me make you happy" now but it fails a basic empathy check. He's not trying to see the situation from her perspective. He doesn't care about how she feels or what she wants.
He feels regret and he doesn't want to lose the person he now realizes could have given him a happy marriage. He is not thinking about what is in her best interest.
Given the fact that she believes she is dying at this point she has wasted years of her life trying to make this marriage work, and should not be expected to spend what's left of her life trying to "fix" a relationship now that he's finally interested in giving a fxck.
A Coyote isn't that large and doesn't have the mass and weight to break a car window....
The window is already broken. Remember when josh shot at the window?
For the plot..
I don't, maybe I need to reread when there are more chapters...