First of all, I'd like to say that this book is a nugget and deserves more visibility, frankly Webnovel do something about it. If you don't believe me, go and ask the people who take out a tier 5 subscription to get 20 chapters in advance. As far as the book is concerned, I can assure you that the plot is going to send some heavy stuff, the main character is developing very well and his identity is forming thanks to the experiences he's going through, which I find quite traumatic. Although there's a system, the MC isn't OP right away and the techniques, especially those using katanas, are very well detailed, so it's not just a slash forward. In short, I leave it to you to discover and trust me !