Why did the core relic of life, the God of Xuanshang, plant a magic weapon on Tian Fei?

To protect Tian Fei. According to the plot of the TV series "Stars are Condensed into Sugar", in order to prevent Tian Fei from getting into trouble at night, Xuanshang Shen Jun had to plant the magic weapon of his life-rainbow light and precious eyes on him at night. Based on the novel of the same name by the writer Jun Hua, Star Falling in Sugar tells the story of a pair of twin sisters with different personalities in the Terran royal family who got married by mistake because of one's own goal, which not only caused countless jokes, but also involved two romantic and beautiful love stories in costume myths.