In 2139, Lin Yu, a struggling postdoctoral fellow, accidentally touched a modified space-time controller, and his soul passed through the body of a poor man in the prosperous Tang Dynasty. As soon as he opened his eyes, he was faced with a huge debt of fifty cents and a "wretched wife." With the countdown to "return in three years" and the iron law of "no modification of history", the mustard seed ring he brought from the future became his only reliance - it contained a foldable flying car, as well as chemical and physical survival codes. When soap locust meets plant ashes, when ten cents hit the trade route of the Tang Dynasty, let's see how this future doctor uses hard-core knowledge to make soap, seize business opportunities, and survive under the shackles of feudalism without touching the red line of history. He is a time traveler who travels between ancient and modern times, and he is also a game-breaker who uses his wisdom to counterattack fate. A fantasy of survival where technology and ancient customs intertwine begins!
