They once met in a sea of flowers, but later they separated due to something. Before they separated, he took out a bright purple crystal bracelet with the word "Xuan" inlaid in the center. He put the bracelet on her and said to her, "Ling'er, bring this bracelet to Saint Silia in the future to find me. Brother Xuan is waiting for you." She nodded in agreement, looking at his retreating figure, the girl quietly shed tears.
Many years later, the girl came to Saint Silia to look for him because of the promise she made. They met again in the ghost world. He was no longer the gentle boy he once was. He changed because of the promise. His heart had become cold until she appeared.