Beautiful

FL gets teleported to another world and now has to act as the Duke's fake lover to fish out the rats that dared to kill someone in his area (it was a prospective fiancee but no feelings)

FL reincarnates as bystander in an R19 world. Finds ML locked up (so he doesnt go beserk) and treats him.

Husband killed covered up by the plague. The murderer that had fancied her and taken as a concubine as well as selling her daughter as a slave, died. Taken in again this time, treated better. Slow burn romance as each of them find it hard to love.