kinda cliche but manga w a mc who acts super weak but is actually op?

op? do you mean top?

Op means over powered, opposing weak

i think it means overpowered

I'm sure they mean overpowered

have you read solo-leveling?

Try this one http://www.mangago.zone/read-manga/flow/

rip bl has dirtied my mind too much haha

http://www.mangago.zone/read-manga/legend_of_the_northern_blade/