Ning Hua was just a nominal female immortal who was greedy for pleasure. It was an accident that she almost lost her soul to save her little apprentice.
Therefore, she had been idle for hundreds of years and was rewarded with the opportunity to be reincarnated and go through many tribulations before she could return to the immortal position.
She lost her memory and fell in love with someone in her mortal body. That person originally understood her and protected her, but later he betrayed her and hurt her. When the sword pierced that person's body, all the past events were remembered together.
She finally succeeded.
She discovered that the man she stabbed to death was actually her first disciple, Yin Chen.
Intention: to do one's own thing