I will definitely check out that string to find more recommendations, but that Heroic Age, I have seen it! What astonishing anime. The fights weren't top-notch, but the sheer scale of the battles and the thought-provoking nature of the notion amid the story were amazing. I only wish there was more of the anime! I have seen the original Old Boy too. That movie was surprisingly good. Much better than I anticipated. Never heard of Urobutcher though. It has a fascinating premise to start. I will have to look it up for a viewing. Hopefully, it's reminiscent of "I Saw the Devil". That movie was great, and the star of Old Boy was in it as the antagonist. It was very much the essence of antihero and revenge movie tropes taken to an extreme.