My Senior Sister Seems Unreliable

[Dual Female Leads + Alternate Universe + Not a Power Fantasy] For nearly four hundred years, Lu Fengning has had only one wish: to die, and stay dead. But no matter how many creative ways she tries to kill herself, she always sees the sun again the next morning. Immortality, something everyone else longs for but can never attain, is a curse to her. A curse from her senior sister. Fate never seems to favor Xu Siyi. Ever since she can remember, fear and hatred have been the main themes of her life. She has to grow up fast. She has to become strong. She has to... Lu Fengning: “You can seek revenge and save the world, but you still have to live your life~ Want some hand-peeled bamboo shoots? Crunch, crunch, crunch, so crispy~” Xu Siyi: “Crunch, crunch, crunch. They really are crispy~” Middle schooler Yuan Hongdou is obsessed with the online game Clash. One day, she wakes up inside its world and becomes convinced for a while that she's the protagonist, fearless under her plot armor. It takes nearly dying for her to realize that the silly, sweet senior sister and her beautiful, strong, tragic partner are the real protagonists. She's just a “tool” in their love story. To return to the real world, she has to complete her missions and follow the main storyline, but... “It's been ten years! The main storyline and all that, even Senior Sister won't follow it!” [PS: This isn't a power fantasy. Like my last book, I'm just writing for fun. Tangyuan only has red bean filling, but no brains, and my abilities are limited, so I can't write anything particularly good. If you don't like it, leave in time. Don't chase after me to complain, or I'll get mad ( っ`-´c)]