- Sofia is 10 years old. At the request of her cousin, Sofia dressed up in clothes that would make her unrecognizable and turned into an old man. She went to deliver the strange medicine made by her cousin to the men who call themselves the world's largest assassin organization, and in return, she exchanged a large amount of money and some special experiment materials for her cousin.
- Sofia is 11 years old, Sofia goes to the assassin organization countless times to help her cousin and they exchange some test tubes.