In the human world, she is a beautiful butterfly. In the heaven, she is an insignificant butterfly fairy. In Die'er, she thinks this life is enough, because there are so many demons who want to become immortals and how many trials they have to go through. But she is lucky. She can laugh every day when she stands in the garden. Although there are many flower fairies who don't like her and treat her badly, she can still laugh, but her fate is not like her. She thought so plainly that she could not live in peace. With the help of the fairy boy next to the Queen Mother, she fell in love with Tong Zhi (Fairy Boy). She always thought that this was just her wish, but she did not expect that the fairy boy also loved her deeply. After repeated tests, can this pair of fairy lovers who only envy mandarin ducks but not immortals be able to get together? Is true love as simple as Die'er thought?