Wow, I can't believe I forgot about this piece of trash. Yeah no, even more so than the psychopath, this serial rapist should die. I have no sympathy for Mingyue considering she was 100% ready to be complicit in what he'd do, but for the duration of that scene, I was more hoping someone would stop him than for anything to happen to her.
What better way than to make his murder the nail in the coffin? It's exactly how much he's worth. Though honestly, he got off pretty light as a result. There were so many other cheating bastards who suffered much more than this scumbag who did less.
It was a bit of a bold assumption to just knock Mingyue out without needing any further input from her to trigger the trap though.