Please recommend me a story where the other characters think the mc is weak but actually t...

I want to know as well

Unordinary
It's free on webtoon. Enjoy ;)

same here ^^

Weak hero (all chaps available on webtoons)

solo leveling

(๑•ㅂ•)و✧

Yesss my fav webtoon

Lookism

Memorize or Otherwordly sword kings survival records

either lookism or solo leveling. i don't recommend unordinary bc mc's character developement was disappointing

Legend of the Northern Blade

Also Beginning after the end
one of my favorites so far

Yeah （/TДT)/ i hops he turns around quickly or i hope he has a reason like it was his plan to act like he did inorder for the greater good. (Like an Itachi character)