Toaru Majutsu no Index - Volume 22, Proclamation of Armistice.

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!

With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

Emperor Xianwu ninth reincarnation, only to break through the shackles, was besieged and killed by masters from all walks of life.

Fortunately, a ray of divine consciousness traveled across thousands of planes to the earth and entered the body of the dead young man, just to get rid of the anger in his heart and to regain that peerless peak!

- Description from MTL

Meng Yang had done a lot of s*upid and wrong things in his life. Jumping around like a clown, annoying and unpleasant. Only after his tragic death did he know that he was a cannon fodder written in a book who only existed to set off the protagonist shou.

There’s an ancient saying in Great Ruins, ‘Don’t go outside when it’s dark.’