An assassin obsessed with revenge and an angel hiding his sins... And a shocking ending that will change everything.

Twenty years ago, Lawrence's family was killed by a man who had a birthmark in the shape of an upside-down cross. As a result, he grew up to become an assassin to get revenge on his own. He's searching for information about the criminal as he fulfills his duties as a hitman, but he hasn't found a single clue. Lawrence's only support is his lover, Theo, who lives with him. Beautiful and kind Theo took Lawrence in when he was wandering around as an orphan and raised him with love and affection. However, Theo has a big secret that will change Lawrence's fate...