Kim Sora has always taken priority in her work. She has never taken a day off in being one of Korea's top detective. Solving crimes and chasing after bad guys is what she loves doing. Her lifestyle however have been worrying her father. At the age of 25, she's still single and the thought of marriage have never once crossed her mind. Growing up without a mother since young, Sora and her father only had each other to depend on with no relatives in Korea.

Before Sora's father succumbed to a his illness, she was married off to a complete stranger, Jung Yunho. Yunho on the other hand had his own reason for accepting to be her husband but Sora didn't bother to question that. She too on the other hand couldn't care less who she was married to as long as he doesn't get in the way of her work. When her father passed away, he carried with him Sora's darkest secret. It was the reason she became a detective in the first place. 

She was a vampire. The last one remaining in Korea.

The only way to feel better about the guilt she have about being one is to give back to the people. By doing good. The thought of her ancestors killing people for to satify their own need for blood just sickens her. Sora pledge not to drink even a single drop of human blood.

Now with her father gone, life continued as normal. Even with a husband, Sora still prioritize her job. Living under the same roof, they barely talked. It began to look like they were married based on contract and their relation were strictly business. However, everything changed when Sora was assigned to solve a murder case. She began to unfold the truth on her huband's background and who he really is...