I Asked You to Take over My Class and Teach My Students to Cultivate Immortality?

[Not brainless + urban + hilarious + passionate + accepting disciples + cultivating immortals + cool writing + space cracks + no female protagonist or single female protagonist] Xue Yi, who traveled to a different world and was unfamiliar with his place of origin, became an unemployed vagrant after graduating from college. By chance, he relied on the opportunity of the college entrance examination reform to become a substitute martial arts teacher in a high school. While others teach students gymnastics, he teaches them exercises; while other students are still preparing for the college entrance examination, his students have already begun to conquer the world and protect their families and country:... I am a professional in teaching students to cultivate immortality. If there are not enough students in one class, then one school, one city, and one country are still not enough. How about a world of cultivating immortals? That's right, the entire world of cultivating immortals is the force of cultivating immortals created by me! Time passed, and unknowingly, the era of immortality was created. A few years later, each of his students became a veteran figure in the global immortality world, leading a party and becoming famous! "It's bad! Principal Xue! Three hundred space passages have collapsed. The enemy is about to land on the earth and enter the belly of Jiuzhou!" "Go quickly, call my three hundred students to come over, and let each of them guard one!" "Shall I call you the top three hundred disciples on the Dragon Ranking?" "No need, just call three hundred!"