How do I break the team invitation from my old enemy?

In Lin Wei's previous life, the empire and the magic world could not allow the mainland to burn in the flames of war, and the creatures screamed under the blade. As the eldest son of the duke, his hidden summoner talent was used by the empire, and he died with his old enemy in the final battle.After being reborn, Lin Wei chose to become a summoner. When he entered the Academy of Magic, he saw that the future leader of magic and the strongest humanoid weapon—Duyu, was just a blind boy who had just entered the academy. ......The black-bellied summoner is set by X's quiet magician Gongxifantasy, sincere and not routine^ ^Content label: The proud son of heaven in another world, a strong and powerful continent, by accident, protagonist: Lin Wei, Duan Yu┃ Supporting roles: Heidi, Daniel