I'm Not Harem

Kim Aera is an assassin. She gets an assignment to go to Switzerland with her best friend, Song Hanna. But the thing was, the plane that Kim Aera was on had problems so the woman was only able to save Song Hanna. Kim Aera fights until she falls from the plane. Song Hanna searched for him continuously, but Song Hanna couldn't find Kim Aera's whereabouts at all. Even though there was a lot of help from Kim Aera's side. On the other hand, when Kim Aera wakes up from her sleep. She was surprised to see so many people wearing ancient clothes, as well as Kim Aera. Someone told him that she was King Inseo's concubine, and many people assumed that Kim Aera was the king's favorite concubine. As for Kim Aera, she is a murderer, how can she become a king's concubine and become pregnant with his child?