What is the name of that drama?

Hi guys! 

I can't find the title of a drama, that I really want to re-watch. 

The only thing I remember was:

- It is an "old" k-drama, something like the 2010 to 2014 (I think)

- It is set at an all boy high school, where they make inventions/work with mechanics

- a girl joins the class (she is not disguised or anything) and she is the main protagonist

Does someone recognize this drama?

I would be so grateful for suggestions!

It sounds like the one kura2ninja mentioned ....only Korean ones I know with engineering are infinite Power and found a college one called Please remember princess but I have t watched it...no high school