The Mystic Heaven Trigram

Setting: This is a world governed by the trigrams. The Five Elements and Eight Trigrams correspond to different kinds of energy: Qian is Heaven, Kun is Earth, Zhen is Thunder, Kan is Water, Gen is Mountain, Xun is Wind, Li is Fire, and Dui is Marsh.

Story: A thousand years ago, he was the hero who saved humanity from catastrophe. Five hundred years later, he became the undisputed leader of the demon race, driving humanity to the brink of ruin.

As the demon army prepared to storm the human capital, Qin Zizhou stood between the two armies and drove his sword into his own throat.

Now, a thousand years later, Qin Zizhou has been reincarnated as a human once more. Who is he this time, and where will his path lead?

(No System + traditional fantasy + Five Elements and Eight Trigrams + subverting expectations)