Yang Xu'an has a sister. As a sister, she does her duty, works hard, works hard, and thinks hard... But things in the world are unpredictable.
Sister: "Zi tut~ You are so beautiful."
Sister: "I know."
Sister: "Zi tut~ You are so outstanding."
Sister: "I know."
Sister: "Zi tut~ I like you."
Sister: "I know."
………
Intention: Sisters working together can break through metal