Transmigrated Into a Female-Oriented Novel, My Junior Sister Is the Villain

Su Yi was a loyal enthusiast of open-world games, yet he was born transmigrated into a game adapted from a female-oriented novel. How did the Divine Might Manor Lord, who was supposed to be childless, end up with a son like him? The Junior Sister he watched grow up is destined to fall into the demonic path? The sect he belongs to is destined to be destroyed? The tragic female lead is destined to feel despair toward the world? "Hey, I never read the plot when I play games!" Well, there's no way to skip this life. Save his Junior Sister, save the sect, save the fe—wait, save the female lead, and let her save the world! However, things don't seem to be going very smoothly. Junior Sister: "I was clearly here first, so why is Senior Brother paying so much attention to her?" Female Lead: "He claims it's dangerous if I leave him, so why is he always going off to find his Junior Sister?" In unison: "Just who exactly do you care about?!"