Chae-a Han and Yunsu Park might appear to be perfect angels at church, but Chae-a is actually a foul-mouthed ex-convict, and Yunsu is... a vampire? When Yunsu blackmails Chae-a over a murder she didn't commit, she starts looking for ways to get out of the situation until the perfect opportunity arises. With Yunsu's life now in her hands, the two engage in a life-or-death game of cat and mouse, only to find themselves falling deeper and deeper into each other's traps...