You and Leon used to date but you two decided to break up because you two knew each other job

You're assassin, he's a spy.

One day, your boss decided to give you a mission and it's a difficult one. To kill Leon. His boss also give him a mission to kill you.

You two decided to meet on the roof, after that you decided to point your sword to his neck. He smirked and doesn't even care about you.

"Kill me."

Suddenly, those love memories stuck in your head.