Reverse isekai
MC came from ancient time, I think she was a governor or something, suddenly transmigrated to modern world as a married woman, whose husband went "missing", now she is taking all the family's heart (bro and sis in law), the husband (most prolly ML) is alive though and has been watching her from her spending lmao (not like she spends a lot, she spends on mostly frugal stuffs), oh she also attracted lots of guys.
Becoming the Unwanted Mistress of a Noble Family