I mean seriously the guy is 70+ years old, and the person he hates most is some kid that he has known for a week? You'd think he'd turn into one of the people from the sect that sent him here. 1/10 bad writing
Solo Leveling doesn't have the oomph it once did for me there's so many other series that copied the formula (not that it's that unique) I used to get super hyped after most of the chapters but this just felt meh