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An ordinary college student, a courier company, a group of strangers with special skills, and an unknown world that exists in another world like a fantasy. A family is destroyed, and the road to revenge is extremely long...

The so-called abacus mental arithmetic refers to abacus-type mental arithmetic. Abacus is a calculation method that uses the abacus as a tool to perform operations such as addition, subtraction, multiplication, division, and square root. There are certain rules and formulas for the abacus movement skills. Once you are familiar with abacus, you will start another type of mental arithmetic training. You can restore abacus through simulation and complete abacus calculations in your brain, which is what we call abacus mental arithmetic.

In her previous life, she fought for him in the world, and what awaited her was not the ceremony of becoming a queen, but the confiscation of her family and the extermination of her clan. A family of more than 300 people were all tortured to death, and their bodies were finally dumped in a mass grave. After returning from rebirth, she has changed her appearance. She will not let go of anyone who deserves revenge or kills! The person who protected her in her previous life will be protected by her in this life! Anyone who hurt her in the past life will not be spared. On the way to revenge, he accidentally provoked Na's Imperial Preceptor. From then on, that noble Imperial Preceptor climbed the wall every night. He originally wanted to beat him up and drive him out, but now he is suppressed even though he can't beat him. What's the law of heaven...