This poem was written next to Qingchuan's portrait. Emperor Yongzheng saw Qingchuan disappear with his own eyes. He stayed in the Qing Dynasty while Qingchuan returned to the 21st century. Their relationship seemed to be separated by a long distance. Yongzheng's feelings for her were entrusted to the moon, just like being next to her wherever she was. You can understand everything after watching the finale of Palace.