心血来潮 — “A sudden impulse, whim, or idea that comes to mind”

During the Ming Dynasty, Chen Zhonglin penned 'Investiture of the Gods,' a novel depicting how King Zhou lost his mandate and his kingdom, while King Wen and King Wu gained theirs, filled with numerous miraculous tales.

King Zhou of Shang was a debauched and tyrannical ruler. He forced Huang Feihu's wife to her death and brutally killed his sister, the Western Palace Concubine. Consequently, Huang Feihu decided to defect to Xiqi and join Jiang Ziya.

Enduring great hardships, Huang Feihu passed through five checkpoints and reached Tongguan. There, the commanding general, his own father Huang Gun, refused to acknowledge him and urged him to surrender. However, Feihu managed to escape. Unexpectedly, he was captured by Han Rong before Sishuiguan.

Huang Gun came to see Han Rong, offering himself and hundreds of members of the Huang family to atone for Feihu's perceived crime, pleading only to spare one grandson. Han Rong, however, refused and ordered them all to be escorted to King Zhou to claim a reward.

On this day, Taiyi Zhenren was meditating in the Golden Light Cave on Mount Qianyuan. Suddenly, he experienced a 'xīnxuèláicháo' (a spontaneous flash of insight or impulse). This was noteworthy because immortals are free from worries, anger, and desires; their hearts are as firm as stone, no longer wavering. The Immortal thus knew what was unfolding. He called upon his disciple Nezha, saying, "Huang Feihu and his son are in great peril. Descend the mountain, rescue them, and escort them safely out of Sishuiguan."

Nezha promptly descended the mountain, defeated Han Rong before Sishuiguan, and successfully saved Huang Feihu and his entire family.