This is, by far, one of the best web novels I've read. It features fantastic world-building and excellent character development. However, the author falls short in some areas, particularly by continuously belittling the main character's depression and labeling it as an addiction. Additionally, he does not clearly explain that some of the main character's childish behaviors stem from his escapism as a way to cope with the trauma from his family background. 

Seol, the main character, can be somewhat annoying at times due to his childlike behavior. However, you'll come to appreciate everything he selflessly does for his friends in Paradise and his efforts to repair his relationship with his family. The fight scenes are well-written and have a strong connection to the past, and Seol's power-ups are generally understandable, especially when you consider his future vision. The choreography in the fight scenes and the psychological thriller elements are described so vividly that I've unwillingly found myself staying up all night out of sheer immersion. While there is an annoying harem element, it becomes negligible since the manmade cockblock of a MC ignores all women except Yuhei. (unless you delve into the side stories). Overall, I'd give it a 9/10—it's a must-read.