I'm looking for a novel that the MC is a genius and everyone knows that. If the MC is a genius in secret then don't even recommend it, I'm sick of novels where the MC doesn't reveal his talent due to his excessive fear of the world Novels like God of Thunder
The Villainous Daughter’s Butler ~I Raised Her to be Very Cute~ Knights & Magic Tales of Herding Gods This young master is not cannon fodder! (RR) Mahouka Koukou no Rettousei Magi's Grandson Silent Reading Shikkaku Mon no Saikyou Kenja~ Sekai Saikyou no Kenja ga Sarani Tsuyoku Naru Tameni Tenseishimashita~ Everyone Else is a Returnee
History’s Strongest Senior Brother - MC was already subtly showing off before the story starts. After a couple of story arcs he decides to be more showy because he needs to lay enough ground work for a bigger reveal. Nine Star Hegemon Body Art - the MC antagonizes people way above his weight class all of the time. In the early story arcs, friends save him, but after a decent amount of power ups, he's a murderhobo taking not shit from anyone especially higher realm foes. Seoul Station’s Necromancer - he's OP from the start and just doesn't care. The Healer Demands Payment! - don't know if this one qualifies as the returnee MC knows skills learned from her previous life, but those skills are only recognized by certain people.
https://www.novelupdates.com/series/genius-of-a-performing-arts-high/ https://www.novelupdates.com/series/gods-song/ https://www.novelupdates.com/series/the-great-storyteller/ https://www.novelupdates.com/series/god-of-cooking/ https://www.novelupdates.com/series/god-of-music/
https://www.novelupdates.com/series/sss-class-suicide-hunter/ https://www.novelupdates.com/series/sword-whisperer/ https://www.novelupdates.com/series/possessing-nothing/ MC is the opposite of genius, but he progresses faster than geniuses without any cheats (no cheats, no items, no teacher, only effort.) And not slow progression.