Jade’s Fall on the Perpetual Bliss 不夜坠玉 by Teng Luo Wei Zhi 藤萝为枝

This is a novel that tells the story of Shi Luoyi, who wakes up one day to find herself transported back sixty years into the past. Her goal is to seek a way to eliminate the demonic influence haunting her heart.

Shi Luoyi was born into nobility but faced hardship early on: her mother passed away when she was young, and her father fell into a deep slumber, leaving her alone to guard the Eternal Night Immortal Mountain. Three years ago, her uncle, the Sect Leader of Hengwu Sect, ordered her to descend from the mountain to train within the sect. There, everyone compared her to her junior sister, Bian Qingxuan, the “Favored One” blessed with extraordinary luck. Bian Qingxuan constantly plotted against her, creating obstacles that eventually led to the birth of a demonic influence in Shi Luoyi’s heart.

Despite always being overshadowed, Shi Luoyi managed to triumph once—and in doing so, grew closer to Bian Qingxuan’s older brother, Bian Lingyu. Now, given this chance to relive the past, Shi Luoyi decides to let go of old grievances and, with the help of Bian Lingyu, returns to the Immortal Mountain to confront and resolve the demonic influence within her.

(Synopsis from Douban)

Shi Luoyi fought with her junior sister, Jinli.

She couldn't accept that she had spent her entire life competing but ended up losing every time. In the end, even her childhood friend and fiancé fell hopelessly in love with the junior sister instead of her.

Dying alone in a dilapidated temple, with no one to bury her remains.

It was infuriating!

Suddenly, she remembered that a long time ago, she had won once: She had an indescribable encounter with the younger sister's mortal elder brother, whom the younger sister treasured as much as her own eyes!

That day, the younger sister was utterly devastated, her eyes bloodshot with fury; Shi Luoyi, on the other hand, felt refreshed and triumphant.

The young man coldly closed his eyes and told them both to leave.

Bian Lingyu loved someone for many years.

The moment he felt closest to her, he learned that he was merely a tool she used to provoke her younger sister and her beloved.

The young woman forgot about him for sixty years.

He guarded her immortal mountain until he grew old.

Under the vast sky, amidst endless lotus leaves, he collected her body from the ruined temple and brought her home.

Even though she had never given him a second glance her entire life.

Shi Luoyi dreamt a lifetime and relived it once more, returning to the beginning of the story.

At that time, she didn’t know the causes or the outcomes.

But behind a door, she inexplicably felt pity for the mortal youth.

She was at a loss, feeling guilty and wanting to escape, but in the end, she still went to Bian Lingyu’s side.

Bian Lingyu took it as another humiliation, accustomed to such treatment.

He no longer expected anything from her.

But this time, in his icy, desolate gaze, the young maiden took his hand, and together they walked through a lifetime of hardships.

(Synopsis from jjwxc)