Musu took Taishang Laojun's immortal liquid and poured it on a peach tree next to his palace. Then the peach tree turned into a little girl seven or eight years younger than him. Musu named her Muzisu and took her with him to raise her. After that, there was a girl beside Musu. This girl is an immortal known to everyone in the heaven. Because she is the youngest but the most arrogant and domineering mistress in the world. Because, Musu's Xuanqing Palace has become one of the most unpopular places in heaven! One day, Taishang Laojun came to Musu and said: Immortal liquid has side effects and will not make you an immortal. So Musu turned his head and looked at Muzisu who was playing in the sand, with a hint of meaning in his eyes: So Muzisu has become a spirit?