Trapped

Chae-a Han and Yunsu Park may be perfect angels at church, but Chae-a is really a foul-mouthed ex-convict, and Yunsu is... a vampire? When Yunsu blackmails Chae-a with a murder she didn't commit, she begins searching for ways to escape the situation until the perfect opportunity presents itself. With Yunsu's life now at her mercy, the two begin a life-or-death game of cat and mouse, only to find themselves falling deeper and deeper into each other's traps...

(Source: Webtoon Entertainment)