They were supposed to be the company's biggest mistake. Two idols who couldn't go five minutes without arguing, suddenly forced into a romantic concept for their new unit. What could possibly go wrong? Apparently, everything. Especially when Yujin finds out she's the girl behind every love song Wonyoung has ever written. (This one-shot is inspired by their collaboration in the special unit exhibition titled "An-Young.")

She was hired to kill her. Now she can't stop saving her instead. Ahn Yujin is an assassin who never misses a mark, until Jang Wonyoung becomes the one she can't pull the trigger on. Bullets, betrayal, and burning chemistry collide as two enemies discover that hatred and desire look suspiciously alike.