My students are all invincible monsters.

Chu Xian lost his sight. He successfully awakened an invincible system, but to his disappointment, the system led him to a world full of monsters, and he had to wait five hundred years for it to be activated. Just as he was desperate, a demonic ape appeared in front of him and asked to be his disciple! In order to ensure his safety while waiting for the activation of this system for five hundred years, Chu Xian de...