My Classmates Want to Destroy the World, but I Am the Savior

"Congratulations to the host, you have been chosen, now go save the world!" As a time traveler, Li Chengshi unsurprisingly awakened the world-saving system, but he discovered that people around him would actually destroy the world in the future! He had no choice but to become stronger silently. When night falls and the purging begins. Li Chengshi will bring the final light to the future.