Apocalypse Principal: All S-Rank

After the college entrance exam, Luo Cheng transmigrates to the apocalypse and becomes a principal by binding with a system. He leads his students to fight enemies through intensive study and practice, expanding his school from an elementary level to a university. Ultimately, to confront an SSS-class world-destroying beast, Luo Cheng sacrifices the power of knowledge he carries. He is reborn under the protection of the world's will, beginning a new life.