Past life
She was the child of a god and a demon, cursed and utterly alone.
He was a once-in-ten-thousand-years prodigy, but fate brought him to meet her.
In her past life, he became her first friend, cared for her deeply, and made a promise before she died: "I'll always stay by your side."
That promise led her to search for him for more than six thousand years.
Present life
She is an ill-fated person who caused her parents' deaths. Every flower and blade of grass touched by her blood withers.
He remains unchanged, neither aging nor dying. He has cultivated a divine body, but forgotten the promise he made to her long ago.
"I want to become your disciple," she says.
"Unless you can impress me in the competition three months from now," he replies.
"Master, are you lonely?" she asks.
"How could I be lonely with you here?" he answers.
One day, her feelings for him are finally exposed. The Soul-Locking Chain at the Lake of Lost Love leaves her horribly disfigured. She did it all for him.
When he raises his sword, her heart is shattered into pieces.
"I'm sorry," he says.
"What good is an apology?" she asks.
"Do you know? I searched for you for a thousand years because I love you, but I can't bear a love like this!"
He believes in fate, but she doesn't. She swears she will change hers, even if it costs her life.
Everyone turns against her. Her old friends draw their swords on her.
Those who love her are dead or wounded.
The person she loves becomes her enemy.