Quick Transmigration: The Male Lead's Comeback System

When Gu Shanshan opened her eyes, she realized she was OUT, and the whole world had gone completely mad. Why was her soul bound to a System? And why was this System such a ridiculous mix of tsundere, villainous, and downright useless? P.S. Expect the unexpected. No male lead is impossible to win over. In short, this is a purely wish-fulfillment guide to winning over male leads. [Villainous Girl VS Coldhearted Doctor] “Doctor, we've drawn 1,500 milliliters of blood. The donor has lost consciousness.” The nurse stared at the amount of blood drawn, trembling. It was already past the safe limit for taking blood from a person. Any more, and she could die. “Continue.” The cold male voice brooked no argument. His icy words stunned everyone present. She had been kind by nature, but people had driven her to become a demon. If the law was no longer just, then she would take revenge in her own way. Even if they called her a psychopath, they had driven her to it. But why was her soul bound to a System after she was reborn? And why was this System such a ridiculous mix of tsundere, villainous, and downright useless? [Delicate Girl VS Interstellar Officer] In 5015, the Earth Alliance entered a new era. Can someone tell her why pure-blooded humans are now as rare as China's giant pandas were three thousand years ago? And why have pure-blooded human women been reduced to egg-laying drones, like queen bees? One moment, a gorgeous blond, blue-eyed hunk; the next, a huge beast. And that handsome silver-haired man with icy eyes is actually a prehistoric giant python with two little dicks. Good grief, she's just a tiny human. Crossing species lines like this is definitely going to get someone killed. If the goal is breeding, ahem, pairing up, could the Leader please assign her a man within the normal range? What do you mean, no? Oh, hell no. Whoever wrote this constitution can marry him instead. I'm not playing along. And you, System, get over here! I'll beat you to a pulp!