On June 13, the fourth year of Jianwen in the Ming Dynasty (July 13, 1402 AD), King Zhu Di of Yan led his army to attack Yingtianfu, the capital of the Ming Empire. Emperor Jianwen disappeared in a fire; this became one of the biggest unsolved cases in Chinese history.
In order to solve the mystery, Zheng He led the largest fleet in the world three years later (the third year of Yongle in the Ming Dynasty; 1405 AD) and sailed to the sea seven times. As a result, more mysteries were left unsolved until 600 years later...
An ancient travelogue, two ancient cultural relics, and an ancient map: three clues lead the internationally renowned historian Zhang Cai, his Chinese friend Jiang Long, Tina, the daughter of a Baghdad dignitary, and two mysterious Japanese figures - Kodama Yoshio and Kanedae, to embark on a mystery-solving mission that spans three continents and two oceans in a battle of wits, strength, and desperate pursuit.
The historical mysteries left six hundred years ago and the royal secrets of the Ming Dynasty will soon be revealed one by one with the cooperation of Zhang Cai and his partners.
Conception: