It's another ordinary day for Jung Seongjae. He wakes up at 10am, as usual, surrounded by trash and clothes all over the place. He gags as he lets out a breath that reeks of rotten eggs and soju.

He scratches his head and realizes he needs to take a shower and trim his beard. It has grown so much over the last four months that it stings on his girlfriend’s cheeks.

Since losing his job, he hasn’t left his house much, except when he occasionally went downtown to douse his desperation with alcohol. He doesn’t want to make his beloved girlfriend believe he’s a loser, but at the same time he can’t help it.

The truth is, Seongjae is so absorbed in his dull and pathetic routine that he doesn’t even know that “Im Sehyeon,” the woman he vows he’ll marry soon, is actually an uncouth assassin hiding behind the façade of a prim and proper girl.

He doesn’t know, but he’s her next target. More precisely, her sixth.