"The Jade Seal of the Kingdom" is a treasure ordered by Qin Shihuang to be made from He's wall. According to documentary records, the "Jade Seal of the State" has been passed down through the ages for thousands of years and is an important cultural relic full of mystery in ancient Chinese history. This important national treasure was mysteriously stolen while on display at the Hong Kong Exhibition Hall. Ma Xiaolan was invited back to Hong Kong to help investigate the case. When Xiao Lan and her friends arrived in Hong Kong, they discovered that their friend had become a suspect in the theft, and the incident actually involved many "costume people"... Xiao Lan not only met Xiao Yun and Xiao Ji who had traveled from the Song Dynasty, but also met Jing Ke, a thousand-year-old knight, and Li Limei, the son of the late emperor of the late Tang Dynasty! During the investigation, Xiao Lan and others discovered that the missing jade seal in the exhibition hall was just a replica, so Xiao Lan and seven others embarked on a treasure hunt, but at the last moment they discovered that the jade seal had disappeared again... What will happen when a princess meets a hero? How will Xiaolan solve the mystery of the theft of the "Jade Seal of the Legend" this time?
