Backlight: She is the daughter of "Heng", the military leader of the Koso military world a hundred years ago, and "Lian", the most powerful charmer in the charm world at that time. At that time, "Ni", the eldest princess of the Zero Palace Realm, admired "Heng"'s domineering and handsomeness. She was willful and proposed the idea of marrying Heng to her father. Unexpectedly, Heng appeared in front of her with Huan and told her how much they loved each other.
Ni couldn't accept this reality, so she ran away and never came back.
Many years later, when the past events had calmed down, Ni came back and became a complete madman. In the eyes of others, she was no longer the aloof princess, but a demon that everyone feared.
Ni deceived Heng, and she took him to a mountain and said it was her last wish, and Heng agreed. Unexpectedly, Ni's purpose was to die together with Heng, but Heng refused. During a scuffle, Heng was slashed and blood flowed out. And Ni suddenly laughed, biting his own finger while laughing, and dark purple blood dripped on Heng's blood, so [Reverse] was turned on...
Gui Lun: He was the only son of the king of Zero Palace Realm at that time. Coincidentally, he and Ni Guang were both born at the moment when the reverse was turned on, so they were not subject to the curse of the reverse, nor would they be harmed by the energy transferred by the reverse. To put it simply, it means that it is not harmed by charm and power, but if it is attacked by force alone, it will still be injured.