Demon King Gu's Comeback Today Too [Quick Transmigration]

This is the first installment. The second is tentatively titled Myriad Realms: Faith in the Demon God. You don't need to read the first one to follow along. If you're interested, feel free to bookmark the upcoming story! The next story I plan to write is I'm a Green Tea Top, and I'm Going Legit! If you're interested, you can add it to your collection from my author page! Synopsis: Gu Yizhao is the kind of ruthless man who'd rather shatter like jade than live on as a broken tile. But he's also a doomed extra in an ancient harem-intrigue novel, chronically ill and not long for this world. Outsiders don't know his scumbag father drove his first wife to her death, that his stepmother is a scheming snake, or how his widely admired half-sister bullies and tramples her legitimate elder brother. In the end, on the day his half-sister marries, he hands her new husband, a disastrous prince of the empire, a cup of poisoned wine. He'd rather die and drag them all down with him, even if he earns the infamy of being the world's most ungrateful wretch after death. He thought he'd face eternal damnation after he died. Instead, he was lucky enough to be chosen by a System, and learned that his death was only the beginning. His half-sister got a System, while her prince of a husband was reborn... Every scoundrel got the best possible ending! To win himself a happy life, he decides to travel through different worlds, helping a whole host of cannon-fodder male supporting characters let go of their hatred and turn their lives around! If gods stand in his way, he'll kill the gods; if Buddhas stand in his way, he'll kill the Buddhas! But just after finishing his first world, he accidentally gets an EX-rank mission: "The Main God" has returned. From then on, Gu Yizhao embarks on a path to becoming the one loved by the "Main God." The story of the Demon King's rise, a companion series to Winning Over That Male Lead from a Starter Novel. Theme: Love life and embrace the world