Chinese manhua — reborn medical/virus

Chinese manhua — reborn medical/virus researcher FL, tycoon family, stepsister steals her thesis

Read this on a manga site (s2manga) about 3-4 years ago, can't find it again.

FL is reborn/reincarnated In chapter 1, the ML wants to break off their engagement. She agrees and says something like "let me prove my virginity" — there's a scene proving this FL is a genius researcher, has a PhD, and made a breakthrough with a virus A business tycoon had used FL's mother in experiments The ML's mother loves FL and makes her an adopted daughter of the family FL has a stepsister who at one point tries to steal her thesis — FL makes a scene and gets the stepsister kicked out

Any help identifying this would be appreciated!