Okay so I’m pretty sure this is not a story that involves isekai.
FL is an abused maid who has lost her memories and ML is the current emperor known for this murderous and violent tendencies.
ML has been searching for ages for a woman across the land and finally he found the FL and takes her back to the palace.
Here’s where things get complicated, so ML apparently has a craving for blood and essentially turns into a vampire(though it is not specifically named in the story) whenever he falls asleep. FL stumbles across the ML is vampire mode and gets bitten.
It is revealed that FL resembles (duh, she must be the woman the ML is looking for) the woman called Tianna/Diana, a high priestess who was an immortal that needed the blood of human as to sustain her existence.
Tianna is the ML’s first love, and the one who caused ML to be afflicted with vampirism by exchanging blood in a sense?
DNF @ Chapter 54
The chapters have been on flashback mode for awhile now and honestly it’s boring. The story between what happened with the ML and Tianna is sad but not interesting enough for me to keep going.
The Tyrant's First Love