The lonely journey of the cold fairy

Bai Siyao was a female devil for thousands of years, and until her death, she made the entire immortal cultivation world feel like having a fishbone stuck in the throat.
When she unexpectedly returned to her youth, suddenly she didn't want to be a devil anymore.
In such a hypocritical immortal cultivation world, it seems quite reasonable to have a fairy like her who is so pretentious, right?
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After being reborn, Bai Siyao, the Jade Devil, mends her ways and decides to seriously cling to a powerful backer to fend off disasters in the future.
For example, Ling Bufei, the young sect master of the Wuji Sect, is not bad. He will be one of the leaders of the Immortal Alliance in the future. Now he is just a poor little fellow with a fatal pulse. She stays by his side unwaveringly when he is down and out. In the future, he will definitely be wholeheartedly trusting and devoted to her.
The plan is perfect. She successfully climbs onto this high branch of the future. But as they get along, suddenly it feels a bit wrong. This person... Why is there something a bit evil?