Heavenly Opposers - Chapter 346 - 345-Plans In Action.

MC Derick, unexpectedly reborn, had thought he could save his sister's fate, whom he had relied on since childhood. However, to his surprise, an apocalypse unfolded...After accidentally killing zombies, Derick activated the Apocalypse King system. Wasn't this forcing him to conquer the world and establish his own ideal kingdom?Thus, Derick embarked on the path of an Apocalypse King, singing all the way from the city of Gray Bear. Want to survive? First, call him “Master.” Whether you are a high-ranking lady, a celebrity singer, a police flower, a school belle, or an elegant beauty, in Derick's eyes, you are merely a slave. To stay alive, behave obediently and serve as a good female slave...

A man was transported to Ancient China and eventually became a servant of a declining household without a male heir. He utilized his wits and modern knowledge to help the household and eventually become trapped in the sea of political turmoils of the period.

- Description from Novelupdates

Arnold never thought his gaming skills would land him in a romance novel—as a doomed side character, no less. To survive, he hijacks the heroine's “system,” bending the story to his will. But when he dodges a deadly duel, he catches the eye of the heroine, Lara, his own step sister—and her love is a dangerous game. Arnold must outwit the plot and his step sister who's not afraid to kill for love. In this LitRPG romance gone wrong, survival isn't just about beating the system—it's about escaping the heart of a yandere.