What's the relationship between Chengai Xue and Eric?

Friends. In the cartoon "The Four Seasons Flowers of the Little Flower Fairy", Eric is the Prince of Parani, and he has a close relationship with Chengai Xue. In order to save the Label continent and relieve the dark crisis in Parani, Eric came to the earth with a new generation of Hua Xian magic messenger Chengai Xue to recover the scattered solar terms.