Looking for a specific title

I started reading it, then I forgot the title, tried finding it myself with no luck :( so I'd be grateful for help

It's either shoujo or josei, most likely a manhwa. The FL is a swordswoman proud of her skills, but the king/emperor deceives her and turns her into a literal magic sword. Then he proceeds to rule as a tyrant, killing people etc. while the FL is aware and suffering inside the sword all the time. Then something happens (I don't remember what exactly) and the FL wakes up in the past, as a human, in her pre-sword days. And of course she wants to change her fate.

I would be very grateful for info on what title it is, thank you :)