Ancient Immortal Master

She is Fuyao, the younger sister of the God of Creation who has returned to the ruins. She is extremely talented and one of the best in the entire world of immortality. She was deceived by the down-and-out young man and saved him because of an accident. She was surprised that as an ancestor, she could be successfully plotted by a junior, so she brought him back to the mansion. Later, she decided to leave this trouble behind because of his cooking skills. Who She knew that she had left him as her only apprentice. At first she thought she had raised a little cutie, but later she discovered that this guy was actually a black lotus. She was a sickly girl who had done many things behind her back. In order to deal with the consequences, she became increasingly haggard. If her apprentice was unable to repay the debt, she would have to let him... PS: According to the setting, the female protagonist is a bug, a slanderous demon, and the male protagonist is sick and paranoid.