Dragon Coffin in the East China Sea

In the first year of the Republic of China, Zhang Yao went into the East China Sea with his good friends Dayu and Xiao Lan to find the legendary "Yi Jing Xuan Yao" in order to find out the cause of the murder of his grandfather Zhang Yao. However, this trip led to Xiao Lan's accidental death. Therefore, Dayu hated Zhang Yao, and the two parted ways. As time goes by, Lao Sun, who resells antiques, seduces Daewoo into cooperating on the pretext of finding the cause of Xiao Lan's death in order to obtain the "Yi Jing Xuan Yao", and induces Zhang Yao to explore the East China Sea again.