It makes me look at him at a different perspective. Having performed surgeries in dangerous environments while still a student is quite a dilemma. But what I do like about the young Hazama is his dark background.
But how did he become such? Well, you won't find it in this prequel because he's just a medical student in this series. He's a medical genius who can operate on anyone with 1000% success rate. A prequel to the beloved series, Black Jack, this show was, in all honesty, trying to fit into the Black Jack universe.
