Read the whole series in an hour? The MC is not from earth, but a powerful magical figure who passed away and is now living a 2nd life. It is made clear from the start he isn't using magic, but physics? You don't have to be an expert in physics to realize it's lacking common sense. Sure there are some explanations from the MC of how a few things work, but it's barely enough to justify the terribly OP things you see? If he will use super sonic air blades, fire explosions out of nowhere, or etc, there should be a fair explanation to what is causingit. Instead every single chapter lacks depth and detail while the power scaling makes no sense.