I'm surprised that no one recommended this yet!! This guy is denser than Bakarina-sama, who is the protagonist of the anime I'm recommending. She was known to be the #1 dense characters of entirety of anime, like remember that denser than black hole meme? This guy right here is seriously stealing her spot. Bakarina sama is clueless about others romantic interest in her, but in this case, he is clueless about how strong he actually is, which is insane that it's funny and frustating at the same time(similar). Everything else might be different, but the denseness will always remind me of otome game bakarina sama.
If you liked
A Man's Man
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...then you might like
Reborn Rich
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A very similar vibe to both the manhwas, both MC's are taken back in time, although in "A man's man" the MC reverts back to his old self, amazing interactions in both of them, MC is OP as hell with his brain in both of them.