[Cold female assassin + sinister villain + devoted male protagonist + sadomasochism]
When the heroine was catching an escaped criminal, she was unfortunately pushed into a cliff by the criminal. When she woke up, her soul was in the body of a female assassin from the dynasty, and she lost her modern memory. She was reborn through the memory of the dynasty's female assassin…
What awaits her is a murder mission controlled behind the scenes. If she cannot complete it, she will be coerced into killing her relatives...
The male protagonist is the most favored prince in the dynasty and is deeply loved by the people. He rescued the female protagonist by chance and developed a crush on her during their long-term relationship. Little did he know that this was the heroine's conspiracy to kill him...
