EX rank supporting role’s replay in a prestigious school - Chapter 343

In the mystical land of Teyvat, where elemental forces collide and secrets of ancient gods remain buried, an ordinary traveler awakens to an extraordinary destiny. Armed with unparalleled ambition and a mysterious system, they embark on a quest to become the Supreme Arbiter—the ultimate authority over all creation.The world of Teyvat is no stranger to conflict, but its hidden truths are more treacherous than any battle. Beneath the veneer of harmony lies a struggle for dominance among divine beings, and the enigmatic Heavenly Principles rule from the shadows. Yet, this traveler defies fate itself, determined to shatter the chains of divine control and reshape the world.Guided by a unique power to harness and manipulate the essence of Teyvat’s elements, the protagonist builds alliances with heroes from every nation—Mondstadt’s free-spirited knights, Liyue’s calculative sages, and Inazuma’s thunderous warriors. However, their journey is far from peaceful. Ancient enemies, forbidden truths, and the ever-present gaze of Celestia test their resolve at every turn.As they ascend in power, unraveling secrets that defy the understanding of gods and mortals alike, one question looms: What does it mean to be the ultimate authority?Will they bring salvation to Teyvat, or become its greatest threat? The skies tremble, the earth stirs, and destiny itself bows before the rise of the Supreme Arbiter.

In his first life as 'Caine Wilson', was the villain—ruthless, cunning, and very powerful.He played his part perfectly, crushing the so-called “protagonist” and parading his enemies, their families, and anyone who crossed him naked through the streets.He watched with glee as the “hero” lay broken, stripped of his dignity, before finally ending his pitiful existence.But just as Caine, thought he had finally won and secured his place at the top, 'Higher ups' intervened.A booming, ethereal voice—like the universe’s pissed-off judge—shook the skies:“You have violated the sacred code of villainy! The villain shall not win. The balance has been broken. Caine Wilson, the world hereby rejects you!”Before he could even enjoy his victory, his world blinked out, like a story whose writer just erased the last chapter in frustration.Everything went dark.And when he awoke, he wasn’t Caine Wilson anymore.He was 'Su Xiaobai', a nobody on 'White Cloud Star', a world of cultivation, martial arts, and endless struggle.But this time, things were different.He could feel it—he could see through the cracks of reality itself.He could break the fourth wall!He wasn’t just some reincarnated soul; he was a villain who had 'seen the system', who understood the game.And he was about to flip it upside down.

A river song, triggered a legend of the rivers and lakes.
Tian Zun’s life motto: “My sword is the truth.”
Shen Lang’s life motto: “To serve people with morality, those who are dissatisfied are dead.”

- Description from uukanshu (translated)

In the endless Universe is eight primordial laws. Each of the eight laws have been fused with a supreme expert, but unbeknownst to everyone, there is a ninth law in the universe. It tears open the Primordial Chaos and is beyond reach.