He accidentally obtained a quantum mobile phone and was able to make calls to the past. As a result, he accidentally dialed Chang'an during the prosperous Tang Dynasty. In order to change his current poor life, the protagonist tries to improve technology, make a lot of money, and even meddle in history by "guiding" the ancient Tang Dynasty people. Unexpectedly, there were also hidden masters in the Tang Dynasty, who began to counterattack the protagonist, and it turned into a game across time and space.
