The Scum Villain's Self-Saving System: Ren Zha Fanpai Zijiu Xitong

Half-demon Luo Binghe rose from humble beginnings and a tortured past to become unrivaled in strength and beauty. With his harem of over three hundred wives, and dominion over both the human and demonic realms, he is truly the most powerful protagonist—in a trashy web novel series!

At least, that's what Shen Yuan, online alias "Peerless Cucumber," believes as he finishes reading the final chapter in Proud Immortal Demon Way. But when a combination of rage and a poor meal choice leads to his death, Shen Yuan finds himself reborn into the world of the web novel, in the body of Shen Qingqiu—the beautiful but cruel teacher to a young Luo Binghe. Although as Shen Qingqiu he now has incredible power and abilities as a cultivator, he’s also destined to be horrifically punished for crimes against the protagonist, so this new Shen Qingqiu has only one course of action: get into Luo Binghe’s good graces before the young man’s rise to power. That’s the only way he’ll escape the awful fate of a true scum villain! (Source: Seven Seas)

Original Novel (Hetushu)
Official English