Shen Qingmu, a modern soul, travels to a prosperous kingdom in an imaginary dynasty. He originally wanted to make a living by telling fortunes on the street by relying on the so-called "all-knowing melon-eating system". Unexpectedly, the first hexagram revealed that his true identity turned out to be the replaced biological daughter of the eldest princess. Emperor Jingmu learned about Shen Qingmu's abilities and confirmed that anyone who had a good impression of Shen Qingmu could hear Shen Qingmu's thoughts. Emperor Jingmu wanted to use Shen Qingmu's abilities to clear up the government and the opposition. The system informed Shen Qingmu that the more he ate melons, the more he could unlock and upgrade new abilities. During the process of verifying Shen Qingmu's identity, everyone learned a royal secret following her voice.
