I think it is a manhwa and it's about a girl, a very strong girl, like jjang of the school if i remebered correctly. Somehow her soul got into a very pretty girl's body. That female lead is strong, a heavy eater. She eventually went back to her own body, after an accident i think... Any idea what is the title for this?

maybe it's Hot Blooded Woman?

hot blooded woman or a love in 100 days?

Yeah, it's this! Thanks!

It's hot blooded woman, thanks!