Gu Yan (Gu Xihan) traveled across thousands of years to find Bai Yufeng (Bai Xiachi). Bai Yufeng died in his previous life because Gu Yan fought for the throne. Gu Yan searched for Bai Yufeng's reincarnation for hundreds of years, and finally found his whereabouts in this life.
Intention: a sudden whim