To me this is a all arounded 9.5 / 10 completed Manhwa. Right off the bat, no super natural abilities or any of the sorts even if it's an Isekai take. The MC himself relies only on modern boxing knowledge while utilizing tactics and simple tricks. Pacing may be slow at times but it's quickly made up for with intense moments and epic battle scenes. The last set of chapters are a beautiful sequence of events that occur when the MC is at an older age. It's at these last moments the impact hits the hardest as he's got nothing but his fists