Unfortunately I haven't but if you have just read this awhile ago ang accidentally backspaces, there's a feature in mangago where you can look at your history of which stories you've read it's beside the notification button in the top right of the cite
Do you know the original language of it?
Chinese or Korean
it was a really long time ago and since then I have read a lot
And it is now complete
I managed to find and I've been looking for it
since the morning
https://www.mangago.zone/read- manga/sealed_lips/
A girl who is a drug genius is abandoned by her fiancé who hates her for using him, after she is attacked by two men, then she is kidnapped by her sister who stole her medicine ideas, where she is then used as a guinea pig to find a cure for an incurable disease, but her body is special so she doesn't feel any symptoms of the disease, she is eventually killed by her sister with poison, she goes back in time to the time her engagement was broken. Do any of you know the title of this? I read it a while ago but I don't remember the title.