Transmigrating to the Great Han for the Perfect Three Kingdoms

At two in the morning, Cao Aman was so exhausted he felt like a dog that had just climbed a ten-thousand-meter mountain.

Cao Aman finally woke up, only to find himself in a desolate wilderness.

His head throbbed, and all four limbs ached terribly. Still, there was nothing seriously wrong, and he could walk. He was simply weak.

In an instant, an enormous amount of information that did not belong to him flooded his mind.

The Three Kingdoms. Wang Yun. Cao Cao. An assassination attempt on Dong Zhuo. Pursued by Lu Bu. Falling off a cliff and dying, then coming back to life.

Wait, shouldn't he be the modern-day Cao Aman, living a life of leisure? Why did he have the memories of Cao Cao from the Three Kingdoms era?