Heavenly Jewel Change - Chapter 768

Reiji Saeki, who lives in the north eastern countryside town, lost his life in an accident during summer vacation. ……But before he knew it, a mysterious ball of light hovered in front of his eyes in a world of whiteness. That ball of light was a magician from a parallel world, and is looking for a person qualified to inherit the magic they had created to prevent it from being lost. Reiji, who rode on that suggestion, now lives in the parallel world Elgin, with a new body and powerful magical power.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

The Six Prefectures of Zhongbo were ceded away in surrender to the external enemies, and Shen Zechuan was taken into custody in the capital, reduced to *a drowning dog loathed and condemned by all. Xiao Chiye followed the scent of the furor and made his way over. But instead of setting others on him, he kicked Shen Zechuan with his very own leg that rendered the latter an invalid. Who would expect this invalid to turn around and bite him in a counterattack until he was all drenched in blood? That was the start of an epic feud between both men who tear at each other every time they come face-to-face with one another.

“Fate wants to bind me here for life, but this is not the path I choose. The yellow dust engulfed my closest kin whole. I have no wish to bow in submission to an illusory fate. The imperial edict couldn’t save my troops, and the imperial court couldn’t fill the stomachs of my mounts. I’m no longer willing to lay down my life for them all. I want to conquer that insurmountable peak. I am going to fight for myself.”

1v1, HE, HE, HE.

◆ Main Couple: Xiao Chiye (gong) x Shen Zechuan (shou)
◆ There’s a yuri cp that are both important characters.
◆ Gong is even more of a scoundrel than the various gege in the author’s earlier novels.

Note: a drowning dog is someone who is down and out having lost favor or power.

- Description from Novelupdates