I actually finshed this surprisingly.
The story is nothing new. We have an ex lover turned bad reunite with his loved one, who is on the good side trying to kill him.
This was a simple read, not too intricate in detail or plot. Like someone said, straightforward. Thus, the story was a bit boring and cliched. Easily predictable.
There just wasn't enough substance in the plot to drive the characters other than "I have mission" must succeed. Ending? Total anticlimactic.