That one finished isekai

So, its a dark haired girl, she is falls into another world like most isekai. And she like a concubine for the king but the king get kill by the ml and the fl witnesses this. And she somehow saves herself by saying shes useful to him and can give false info about the killer. Anyway, its finished, and even goes onto several gens after and new isekai girl. Idk if this is enough info but i only read a few chaps and also the final chaps bc im impatient. Now i want to try reading all of it. Its also long.