I added some of my own imagination to the original background of "Tutor". . .
The third power of 7 refers to: "7 Vongola rings", "7 Mare rings", "7 pacifiers of the Rainbow Son". And the rough stone of 7 to the third power is the cornerstone of the creation of the world and an important force in maintaining the stability of time and space.
In addition, there is a ring of timing on each of the four corners of the 7 to the 3rd power rough stone, representing the four seasons of spring, summer, autumn and winter respectively. They are responsible for monitoring and protecting the members of 7 to the 3rd power and the rough stone.
The heroine is scheming, lazy and not omnipotent, so she gets a ring and a box.
Paired with Brother Que. (Brother Que is really popular...)