Prehistoric Sign-In: The Three Pure Ones' Adored Little Ancestor Is Gorgeous and Badass

The heroine, Yun Zhao, transmigrates to the Primordial World during the era of the Beast Calamity. She is the younger sister of the Three Pure Ones, who take human form early and become fiercely protective of her, doting on her as devoted older brothers. The Three Pure Ones stay together. She has a sign-in System and receives billions of merit points in the beginner's gift pack from the start. In the end, she resurrects Pangu. A feel-good power fantasy. Her CP is Fuxi. They are both strong, and their relationship develops over the course of the story.