After Ascending, My Junior Sister Became a Disposable Workhorse

[Strong female lead + strongest heroine + play the pig to eat the tiger + loyal dog] Pei Yunsu transmigrated to the cultivation world and worked herself to the bone until she finally ascended. She thought she could break through the void and return to her true home, only to be told that ascension meant sacrificing herself to work for the Heavenly Dao? Absolutely not! So what if she was thrown into another small world and merged with its Heavenly Dao? There had to be a way to free herself from the Heavenly Dao and return to the modern world. For that reason, Pei Yunsu quietly transformed into a mortal, all so the Child of Destiny could fulfill their mission along the original path. What? The villain has awakened, can retain their memories through every rewind by the Heavenly Dao, and plans to use that to cause trouble? None of that matters against her power! The villain wants to kill the Child of Destiny in the cradle? Pei Yunsu steps in and makes sure the villain's plan dies before it can get off the ground! The villain wants to take out the boss meant to help the Child of Fortune level up? They can go lie down over there and stay out of her way! After protecting the Child of Destiny all the way, the final battle finally arrives. Pei Yunsu faces many choices along this path, but she knows she will never abandon the goal she has pursued for thousands of years. So she will have no regrets. But can someone tell her why a minor character has declared that he'll follow her forever?