I'm almost positive Xia Mo and Chen will end up together. Taiwan isn't big on changing storylines, especially since the book it's based on is a hugely popular one.

The way he looks at Xiaomo does not denote love to me but a "hmmm, where shall I dispose of the body?" reaction

I think that's because he's trying to figure out how he knows her. According to plot, he lost his memory right after she told him she hated him. So it's probably confusion, with residual anger.