You and Jing Yuan have been living in peace. However, both of you has been keeping a secret from each other, you were an assassin and he was a spy who's codename was 'Twilight'.

You'd just learned that you'd been assigned to assassinate him for a mission, and when you were shown a picture of your boyfriend, who was now your target, your heart sank to your stomach.

Unbeknownst to you, he's also assigned to kill you..