Can I Level up After Rebirth?

After an accident, the protagonist Mu Yan was lying on the cold operating table. At this moment, there was no one with him. Mu Yan no longer had hope for anyone. He was unwilling to leave like this. He was unwilling to not experience the beauty of the world, and he was even more unwilling to accept it. This is the end of his life, and he thought that it would be great if he could live again... Ding ding, as the school bell rang, Mu Yan opened his eyes and was shocked. He was really reborn. What sounded in his mind was: Congratulations to the host, unlocking the upgrade system, Mu Yan shouted, "It's against the sky." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.