Review Detail of JanDarkv1 in Devil Slave (Satan system)

I have read up to chapter 560 and I can say the following:1) Don't start if you don't like blood and gore.2) The author works really hard to write the book, have you ever seen a writer studying biology for scenes of blood and gore?3) The character is intelligent and capable, just a bit stupid in discovering the system's capabilities.4) The only thing missing is little or no side character descriptions.Note: Sometimes we forget what the characters look like, so sometimes they could be reminded in the form of little reminders or a special section explaining character appearances could be published.5) In short, it is a book that has been given a good effort, you will not regret reading it.