All in all I would say that Change the World was a pretty good manga. I thought that the main character, the side characters, and the story were all good. The main character had a terrible life and decides to commit not alive. He meets this dude who is a seemingly perfect cop, with some messed up secrets. There is also An and Cockroach who are pretty cool side characters. I thought that the ending was also pretty good. I would say more about the story, but it would be spoilers. I do feel like it kinda did a 180 in regard to the detective's personality near the end. I also think that they could have elaborated more on what happened to An and Cockroach after everything wrapped up.