Like the title =)
Or kinda like in City Hunter where the ML acts like he's just a nerd who can't fight or do anything besides nerdy stuff :)
Male or female protagonist doesn't matter.
Healer
Bridal mask
https://kisskh.at/discussions/recommendation-forum/121729-someone-acts-silly-dumb-but-in-reality-is-calculating-and-smart
Gokusen
