This is actually pretty good story overall, yes like other people said there are a few issues with the IQ of characters but I put that being that they were in a new situation and wanted to act the part (mostly the Empress) but my issue with the story that I think was a massive plot-hole was that ... couldn't the MC Zombie King literally grow wayyy faster? For whatever reason after a point, he basically stops upgrading the 1st/2nd/3rd zombies he controls and just kills them? He could literally just farm them much faster by taking existing zombies and upgrading them - instead he for unknown reasons just kills the lower level ones and hopes that he gets control of higher ones. Not sure if its the way its written/translated but I think that was really a bad plot hole to nerf MC for ... reasons? Unless of course he does this in the background or something...

It was decent up to the first third about - then it kinda got vague with all the power up and stuff and then ended with a basically random ass pull from nowhere that wasn't even really shown throughout the story ... and then the ending wasn't answering quite a few questions that should have been so yeah - okay story to read for just wasting time but not really that great for deep reading.