A letter and four ancient coins start an adventure belonging to the land of Longyuan.
Zhang Xiaoluo, a young man from Lanzhou, received a mysterious object from his uncle on the day before his 21st birthday. Copper coins are used for divination, and good or bad luck is unpredictable. When all four coins face up, the trumpet of fate has already sounded.
He embarked on a journey with his best friend Liu Hao, from the Tianshui Ancient Temple to the Qilian Mountains.
The old traces of Fuxi, the remains of the Silk Road, and the fireworks in the northwest markets are intertwined with mysterious and strange things.
What kind of unknown secrets are buried under the loess.
