Job Change for All: from Mathematics Learner to Creator

The human race entered space, encountered alien attacks, and was forced to return to their ancestral planet. When the race was about to be exterminated, a game came to reality, and everyone could awaken their profession and gain the ability to fight against alien races. Zhang Xuan was afraid of death, so he gave up the SSS-level career and chose the math learner career with no offensive ability. When mathematics met physics, a different kind of upgrade path began, and the alien race also ushered in their most stern father.