She basically starts trying to kill him when he hits her because she reminds him of the woman who killed him which was reasonable but she is often described as not narrow-minded or idiotic but she really is. Whenever the MC saves her it makes her want to kill him even more which the MC is cool with for some reason. He acts all profound but is an idiot because he thinks that since he knocked her down it was repaid when he saved her LIFE a second time even though he already saved her from the zombie monks literally moments before that. Even after he gives her a free ride to escape a haunted temple she still wants to kill him and even stole the treasure that was literally inside of his palm. Even then he acts like it's OK and let's her continue to stay with him even though she just stole his dew drop and he knows she wants to and has the ability to kill him.
Now on to the plot. The plot is pretty repetitive and drawn out in all honesty since what the author seems to think is "Oh, the MC has a base and is growing a strong force now, better somehow send him far away to build another base". Also the author really likes zombie hordes conveniently attacking the city or base that the MC is in and so the MC has to stop the horde and in doing so establishes his might or something. The harem in the novel is also pretty badly written as what happens is basically: There's a beauty that falls? In love with the MC and the MC has s*x with her once then she disappears into the harem of ever growing girls. The MC also seems to be the only person with an actual special class and abilities since everyone else can basically be described as: shoots guns, swings swords, uses magic, or is a psychic and every single one of them don't seem to have any actual unique trademark skills or abilities other than those. A lot of the enemies are also weirdly dumb at times, which I'll chalk up to plot armor. Also somehow the Kingdom of God, what has been called the strongest power in the novel can't take care of a little dictator in vietnam when they already took over Europe. Another thing is that the Kingdom of God somehow becomes that big that quickly, like I feel like if they appeared when the MC took control of China then the overall timeline would make sense. But the plot is probably going to develop like so: The MC kills the vietnam guy and then somehow winds up in Japan or something. There almost everyone is going to be racist and it's his job to rally up all the Chinese, which there will be enough of to take over the country with despite the fact that they're in a foreign country. Then he'll meet some kind of op animal that's stronger than his other animals and somehow tame it. After he conquers a city, a zombie horde is going to show up and he's going to need to fend off the zombie horde by digging holes which noone seems to have ever thought up of aside from him and by using the scum battalion.