A double life is too easy - how about your triple or quadruple life?
The ( somewhat) nameless protagonist of ‘The Academy's Undercover Professor’ must have thought something like that. We don't learn much about him, only that he influenced the world under a few different names. Be it as the ace of an army, a feared master thief or an incredible monster hunter. However, this life now seems to catch up with him when his disguise is destroyed and he has to spontaneously assume the identity of an acquaintance who died in the same attack that destroyed his disguise. To avoid being discovered, he has to take on a job as a professor at the best academy in the country and soon realises that both the school and the professor he is now impersonating have some secrets.
Even though it's just one of many names, the protagonist is usually called Professor Lupen, so that's what I'm going to call him here.
To be honest, I don't know if I even need to do that, because I don't have much to write on the topic. The manhwa works for me because the professor, for all his idiosyncrasies, does have a heart for his students and research and so is often caught in a dilemma between his secret goal and his passion for the job. I particularly liked his passion, which often made him appear fatherly and thus won him many friends.
Unfortunately, I have to criticise the 1917191 double lifes that Lupen has here. Everything feels a bit flimsy because there are so many secrets and ambiguities that you're always unsure whether you're understanding everything correctly. So it never feels completely satisfying when one of the 8905449 questions is answered and it's hard to get into the story, precisely because there are so many uncertainties and it's unsure which direction the characters and story are going in.
In conclusion, I would like to emphasise that this feels like Swiss cheese. It's quite tasty, but if you have one too many bites, you'll come across holes that just pile up with the bites. 7 out of 10 potato points.