Not bad. Some of the main character's decisions are dumb, but they can be accepted as part of his character. But I can't read any further.. There are problems with how the main character can withstand so much time, if it could have been tolerated before, then after he spent 60 (!!!) years, and only in a couple of months (a couple of years? over time, there were already problems) he turned from a weakling into a superhuman. And he was just waving his fists. 60 years. And what has he achieved after 60 years? The ability to use a powerful skill 3 times, that's all.(and it's not powerful enough to spend 60 years on it.) Perhaps author will try to explain it later, but most likely there will be even more problems with the timing.