unable tolerate the strict rules and the miserable days, yang guo decided to escape, but accidentally broke into the ancient tomb of the forbidden area, where he met xiaolongnu (played by chen yanxi). in this way, yang guo became xiaolongnu's apprentice and practiced the martial arts of the ancient tomb. as time went by, the relationship between yang guo and xiaolongnu gradually developed beyond the master and apprentice. li mochou (played by zhang xinyu)'s intrusion caused yang guo and xiaolongnu to be involved in the chaotic disputes in the world. what they have to face is not only the bloody struggles openly and secretly, but also the long 16-year separation.