Resolved Female disguised as a man/guy/male (BG)

I forget about tittle and I already endeavor for searching but I'm not get the novel.
Description:
She transmigration to the a book or a novel. She use body master of the cannon fodder (or other character but not use body MC novel original). She disguised as a man and come to school special man (maybe).
She try near to villain boss (be cold) (?) and for make herself like man and so as not to be caught, she trying to form abs packs.

And yeah, villain boss pressing her under the body him.

Please help ya, I really really dizzy

 

I think it is Being a Supporting Female Character at An All Boy’s High School (Transmigration)

 

I think so too. She also gets a customised (cucumber) to be the part.

 

haha oh yeahhhh, and it accidentally started working when she did something with the ML, it was so funny, I’m not sure if it is actually that or Transmigrating to Before the Big Boss Blackened

 

Aaaaaaaaaa THANK YOU SO MUCH. Finally, I found it.

 

So which one is it?

I cracked up so hard when that happened

 

This is Transmigrating to Before the Big Boss Blackened