"X521, remember, you are a weapon.
You don't need any emotions, you just need to complete the task I gave you..."
Killer X521, a person who knows nothing about anything other than killing, received a new task: disguised as Bai Yumo, the fake daughter of the Bai family, to help her superiors get rid of the Bai family by stealing information about the Bai family. However, how will she complete the task in the Bai family with a lack of common sense...
