You Call This Teacher Useless? He Can Cast Forbidden Spells on a Whim

[Other world] + [No System] + [Magic] + [Overpowered] + [Revenge] Yu Hui was cursed by a god and suffered endless torment. Even as he lay dying, the gods manipulated him. He transmigrated to another world where everyone could use magic. But because of a seal, Yu Hui alone was unable to use magic and was called a useless teacher. Facing such a hellish start, Yu Hui only sneered: “God, are you afraid?” [Improve magic, starting from its very essence, and create limitless possibilities.] [Break the seal and casually cast forbidden spells instantly, without an incantation, using the power of a god.] In this life, I’ll take revenge on the gods! And, while I’m at it, I’ll enjoy a happy, shameless life with my adorable students. The Holy Maiden of the Church: “Teacher, please order me to do whatever you wish...” The princess: “Master, please give me your orders...” The cat-eared big sister: “Meow! Dear little Yu Hui, kitty’s right here!” The sword spirit girl, the vampire princess, the succubus girl...