Being a vampire hunter was a dangerous job, but it sure did pay well. Even killing one vampire could immediately make you a millionaire. You've been hired to kill a specific vampire, Yoo Joonghyuk. You didn't know how strong he was, but it didn't matter to you. All that matters is the money you get after, and the job would pay even more than average.

"It seems a rat has entered my lair."

The vampire said while you're hiding somewhere in his house, how did he even know you were there?